No. 3 has hit the image limit, and this whole deal is basically nothing but images, so here we go.
Rhombohedral hematite, Elba Italy. Collected January of 1925.
Snowflake obsidian. I've been running into little polished thumbnails of this stuff all throughout this gig, but this is the first really sizable piece I've seen.
What the notes describe as a " 'Slipon' point-pulls away from shaft."
"Bird point-doesn't come away"
Both from Doonville Arkansas
Another specimen of archimedes, from Keokuk Iowa again.
Some exoskeletons from some sort of arthropod. Anyone care to weigh in on these?
Most of them are looking rather bleached, but this guy has some good detail.
Never really occurred to me just how dense this stuff is. This little sample has got decent heft.
Descloizite, Mammoth Mine, Pinal County Arizona.
Kind of weird to be holding this. Not only is the mine closed, but its sealed too, and the whole town's been demolished. Eerie.
More prehnite, smaller sample but with a coarser texture. Patterson New Jersey.
Apatite w/ blunted terminations in pink calcite. Turner's Island, Lake Clear, Renfrew County, Ontario. Collected 1971.
More of that good old lead glance. Vinegar Hill Mine, Treece Kansas.
Can anyone tell me what the deal is with these plaster labels? This isn't the first I've seen. Was adhesive paper a rarity at one point? It seems like a bit of a fuss to carefully smear plaster onto your specimen, wait for it to dry, then write on it when you could just slap a sticker on it or even just write up a label and put it and the specimen in a separate box
Iridescent limonite, Black Hills South Dakota. Last one for today, >>2166587 suddenly has me in the mood for fried chicken.
>Can anyone tell me what the deal is with these plaster labels?
they don't get separated from the specimen is all.
I have a book entitled "Rocks and Minerals" from 1957 that recommends a small dot of enamel with a number written on it. The number to correspond with a small paper label and a listing in a catalog giving identification, location, date, etc. Writing the entire label on the specimen seems excessive, but perhaps that was the thing to do back then?
possible, but it looks a hell of a lot like vug infill I see in karstic marine limestones. Pic related. Some nailhead spar and dogtooth calcite from a vug near the contact of a marine limestone and overlying dolostone.
I'm not sure exactly how the spiderweb kind of growth gets started, but it doesn't grow in parallel with the strata. I dunno. I don't think it's a fossil though because this particular piece comes from a unit full of ruggose corals and crinoids while the rock above is full of brachiopods, crinoids and bryozoans. It's not uncommon to find fossils there preserved in calcite crusts, or fossils in vugs, but I don't know of any animal in that particular fauna that looks like this little cluster.
>I'm not sure exactly how the spiderweb kind of growth gets started
I think this chunk from the same locale might give a clue though...
a bunch of angular fragments of limestone piled randomly and then cemented together with pretty little calcite crystals.
I can imagine some process dissolving the limestone away and leaving the angular lattice of calcite outlining the ghost of pebbles past. Perhaps.
The color here isn't as nice as the last specimen, but these "barrel prisms" seem to be rather uncommon if the prices they fetch on ebay are anything to go by.
Interesting, thanks for the input. Great specimens by the way.
I plead the 5th
Thanks, that helped.
Chiastolite in polished matrix. Madera Co. California.
Calcite with color zoning. I tend to assume that black coloration is a result of iron oxides like magnetite or ilmenite.
If I were to make one suggestion, a scale in your pictures would be nice. I use a ruler for the photolog I'm going to turn in to my bosses at the end of this, but for just casually showing people neat stuff I find putting your hand in the picture provides a more intuitive sense of relative size.
Covellite, Butte Montana. Part of the same wealth of copper that formed that chalcanthite from earlier.
Since this stuff is usually a secondary mineral, I figure that the fine yellow crystals are chalcopyrite that's been altered over time.
Underside. As far as pretty colors go, I think cupric minerals might be some of the best around.
Epidote on quartz, Germany. Collected 1935.
This is one of those specimens that you really ought to see in person to really appreciate. This thing glitters like a highly marketable vampire.
"Carbonate of iron" (aka siderite), Harding Co. South Dakota.
Crocoite, Adelaide Mine, Tasmania.
Goddamn I'd like to have a sample of this for myself.
Staurolite "Fairy Crosses", crystals displaying the mineral's characteristic 90 degree penetration twinning. These things have understandably popular as personal decoration or good luck charms among Christian peoples since antiquity, but staurolite is also a good index mineral for determining what metamorphic conditions the host rock was subjected to.
I tend to be suspicious when I see specimens of this stuff that are too perfect, there's a big knockoff industry of casting crosses in glass and the like and selling them as actual mineral specimens.
Post anyway. I like to hear people talk about specimens they're knowledgeable about.
Last one for today: Interesting little dual-chamber geode. No locale listed.
What the heck, let's start off today with something that I have no idea what it is.
"Painted Obsidian", Alamos, Sonora. My best guess based on pictures of specimens from that area is that the red mineral here is an atypical manifestation of clinozoisite.
Amazonite from Pike's Peak. Color's not so great but the size and shape are pretty impressive.
Not exactly natural but...
Cannon shrapnel from the battle of Antietam. Grapeshot I guess?
Vial of black sand. Has a briny smell to it, so it's probably from a beach. He went to Hawaii at least twice, so it probably came from one of the beaches there.
These glass alka seltzer bottles seem to have been quite popular with the collectors of yesteryear. I've seen them in alot of other old collections.
I retract my dumbass theory regarding the nature of the red mineral. I kept looking and this stuff matches another collector's sample of red cristobalite from the same area to a T. Evidently its related to hydrothermal alteration.
Azurite and malachite on the back. Not sure why this had to be labbelled twice.
"Serpentine 'Chrysotile' Often called Asbestus. Colorado Springs Colorado"
The misspelling and the need to clarify on "Asbestus" is interesting. Is asbestos a relatively recent term for such minerals?
Lepidolite, a secondary lithium ore. Rapid City S.D. Collected 1932.
Here's another one for you Leadville Anon.
Massive cerussite with galena.
I imagine massive cerussite is far more common than nicely formed crystals, but I think the pattern here is really pretty.
Never seen this particular habit in person before.
That will be all for today.
In the interim, here's another sample from that skarn deposit I mentioned last thread. This one is pretty rich in hematite compared to a lot of the material I've seen out there. If I were on the lookout for iron to make Shermans and M1 Garands I'd definitely grab this.
any gold in that one?
>I imagine massive cerussite is far more common than nicely formed crystals
It might have been back in the 1800's but if so it all went to the smelter, I've never seen anything like that on the mine dumps.
Lead was the ore that carried the silver values here though, so it pretty much all got crushed and smelted. Galena and cerussite are more rare on the old mines here than gold is. Lead also made a really convenient flux for the smelters so even if it didn't carry silver they bought it anyways. It had the added value of being easy to get rid of once its fluxing work was done - they'd just pump air through the blast furnace and raise the temperature and the lead would oxidize and fly up the stack as a fine mist of airborne litharge.
The upshot of that was we had something like 15 giant smelters dumping hundreds of tons of lead a day on the town every day for 20 years straight. Which is one reason we're now a Superfund site.
Anyways, here's one you might be able to help me with- Pic is of some chalcopyrite in my son's collection. It's store-bought and came from Mexico.
the interesting thing about it is the large red garnet in the foreground. It appears to be stuffed full of peridot or some similar green crud. Ever seen anything like this before? I'm not even sure what it is, except that it's at least as hard as the red garnet around it. Reminds me of a reverse watermelon tourmaline but I'm pretty certain it's garnet shaped.
Half dollar for scale.
No gold that I'm aware of, just tons of common andradite and hematite.
My best guess for the color would be that you have a compositionally zoned garnet there, with different substitutions into the garnet structure resulting from changing conditions leading to different colors as the garnet mass grew. The green could be demantoid from the substitution of chromium into andradite, while the red could be almandine since iron was clearly present in the formation of this specimen, or possibly andradite with a different substitution. I'm afraid it's rather sketchy to try and determine the nature of a mineral based on color, especially a garbage-can mineral like the garnet group. Any info on exactly where it came from in mexico? The exact locale would help narrow down the possiblities.
>a compositionally zoned garnet
that's what I was looking for! thanks very much for ID.
>Any info on exactly where it came from in mexico?
unfortunately no. The label just says Mexico and the owner of the shop couldn't even remember when she got it in.
My best guess would be a core of demantoid and a rim of some Fe-rich garnet then. The color of the core matches well with some specimens of demantoid I've seen out of mexico, and the presence of chalcopyrite provides some degree of constraint on what elements were present at formation. I'd assume the whole shebang is metamorphically derived, I don't really know of any other situation in which garnets would develop both the zoning and the texture you see here.
No documentation on this one, but I'm fairly confident in identifying it as wavellite
Smithsonite. Inyo Co. California. Collected 1947.
Pyrite on quartz and asbestos matrix. Matrix minerals are nice but if I were a dealer I'd have no choice but to bill them as micromounts so I probably won't bother to photograph them.
Interesting habit here. Not quite sure what to call it.
Never listen to anyone who says there are no straight lines in nature.
Bloodstone jasper. Evidently this is gem quality, but I'm no judge of jaspers. Collected in India by a Mr. Rossweiler, purchased by Mr. Bruner in 1935.
I'm not sure how I feel about the common practice of cutting and polishing malachite honestly. I kind of like my specimens rough, though I do understand that the internal structure of the specimen is a pretty interesting feature, worth showing off. If I were to add malachite to my personal collection I might want a specimen that's half rough and half polished.
So I guess I just have to forget the picture at least once a thread now? It's a tradition at this point.
Here's an almost, not quite specimen. Notice the partial leaf on the bottom right there. Imagine how awesome having two full fronds in a single slab would be.
I'm glad you like it. I was a little bit disappointed when I saw those scratches.
Other half. Seems to have partly been preserved as coal.
This will be the last for today, I've neglected my poor camera's battery.
I'm afraid I've pretty much blown my wad as far as arthropods go, at least from the drawers I've cataloged thus far. Here's a big trilobite from a display out in the hall through.
Also, it came from the fucking Campito formation. I marched all over Campito outcrops all through field camp and all I found was a few slabs with salterella in them.
Here's one of those specimens that got hit with pyrite bloom I mentioned earlier, but it's still pretty interesting.
Topside here is sphalerite with a few bits of chalcopyrite that managed to not decompose, with a single cube of galena.
Tetrahedral chalcopyrite "sphenoids", some of which are still fully intact, on dolomite on the underside.
From Barr Mine, Vinegar Hill, Treece, Cherokee Co, Kansas. Collected 1936
"Lead glance w/ zincblende" aka galena and sphalerite. No locale listed.
Marcasite sphere, Galena Illinois. Collected 1920.
Radiating millerite in calcite. Keokuk Iowa.
Hematite-rosette form. St. Gothard Switzerland.
This WAS chalcopyrite from 4000 feet deep in the Magma Mine, Superior AZ.
Store your specimens well people.
Argenite, Comstock Nevada.
Not much to look at I know, but this is where silver comes from.
Fowlerite, a variety of rhodonite w/ zinc substitution, which makes it a less intense pink than pure rhodonite. Franklin NJ.
This is pretty cool, fowlerite was apparently rather rare as good crystals before the deposits in Franklin were discovered.
Orpiment and granular realgar on radiating stibnite mass. Manhattan, Nevada. Collected 1936.
I don't care what the Indians tell you, this is not a good choice for a depilatory.
Last one for today
"Orpiment", though to my eye it looks more like a realgar crystal that's been altered to pararealgar only on the outermost layers. Kurdistan.
I don't think I could ever have realgar in my personal collection. The fact that a nice crystal rots away into yellow powder if you shine light on it too often just turns me right off of it. I'd put it in a box and stick it in the closet and end up forgetting about it.
With that said, it still drives me right up the fucking wall when I walk into a rock shop and see a bunch of "realgar" in glass display cases that's clearly been on display so long it's been completely altered into fragile little nuggets of pararealgar.
Cubic argentite is only stable above about 340 F. Below that it settles into monoclinic acanthite.
In the Comstock Lode that probably happened pretty recently (last few thousand years) at relatively shallow depths. It was a hot ore body, temperatures in the mines regularly pushed 130 F and scalding water was often found when drilling new stopes.
In the Mexican silver mines the transformation was much deeper and somewhat older- they were also often hot mines but nothing compared to the Comstock.
The huge blocks of argentite after acanthite mined in Aspen and Leadville Colorado on the other hand were cold, the transformation being completed at great depth not long after the ores were laid down about 35 mya.
So this drawer is filled with nothing but barite crystals
Paseo la Cresta Road, Palos Verdes Estates, California. Collected Fall 1981-Early 1982, along bank just west of Mason.
This one has enough sand inclusions that its almost a desert rose-type deal.
Alright last one. I'm going to find a drawer that's a little less monotonous.
Can anyone recommend a good online gif creator? One that I don't have to fuss with account making and whatnot for? I've got a few pieces of flexible sandstone here that I'd like to show in motion.
In the meantime here's a fossil fern with pretty good detail and relief showing what I assume is an older growth with younger growths branching off from it.
The rest of the drawer is full of modern sea shells. I'll post the prettier ones.
Disclaimer: I don't know shinola about seashells and I'm using one of those seashell charts they hang in giftshops in coastal vacation towns to ID these. If I'm wrong, let me know.
It seems some smaller creatures really went to town on this one after it died.
Sorry, those were all that was in here.
Snail of some sort, got a Soho-artisty kind of color scheme
Cones. I think the little one is a Hebrew Cone?
The two halves are still connected by some desiccated flesh
I think I prefer handling fossilized bivalves. I'm terrified of breaking this thing.
I want to say these are turritellidae but I'm not 100% sure.
Last for today, small washed out gif of that flexible sandstone. Not in love with it, but the important thing here is that you've got a rock that flexes. May or may not bother with this sort of thing again in the future.
Sorry that today's drawers were rather lackluster. If it makes any difference I'm slightly ahead of schedule now.
>matrix is clay minerals
Scratch that, the thing is cemented with clay group minerals, and plenty of them to allow the stone to flex. There could be clay particles in the matrix as well, but if there was no cement this would be a pile of sand and sandstone and the fact that it's not cemented with silica or somesuch is the important part. Sorry for the mixup I was trying to answer and eat dinner at the same time.
The Folks used to have one of these decorating the bathroom.
Small bundle of these things tucked away on the side of this drawer. Some sort of bicolored reed?
Petrified oak. The above two are from Washington, this one is from the South Dakota Badlands.
Lapis lazuli. Ontario Peak, Cascade Canyon, Upland California. Collected 1957.
A few sheets of the mica have grown into the tourmaline crystal
Evidently Mr. Bruner needed to stop by the gift shop as well. I think this was originally one of those deals with the layers of colorful sand in a bottle but it's gotten a bit homogenized.
Actinolite var. smaragdite with ruby. North Carolina.
Gem gravel from Ratnapura, Ceylon, what is now Sri Lanka. Collected 1938.
Presumably we've got a mix of beryl, corundum, tourmaline, etc here.
The note peaking out from underneath the stones is Bruner's description of watching the locals mine for the gems: They dig shafts through the farmland into ancient flood plane placer deposits and sluice the good stuff out by hand. Apparently methods haven't changed much since then, the low impact mining methods they use are mandated both by law and by the fact that they need to grow food in the same space.
No documents on this one. My best guess would be a sodalite group mineral.
Garnet and hornblende, Maine.
That will be all for today. See you next week folks.
Looks like even the best of them fall into the simplest of traps...
Oh don't get me started. This guy was on dangerously close to the border between collector and hoarder. He put everything he could get his hands on in this cabinet. Not only did he go fossicking himself, he was also a member of the mineral of the month club, and he had formal and informal relationships with numerous collectors. I haven't been posting them but there are PILES of business cards, flyers, etc from mineral dealers, fossil dealers, museums, gem shows, etc. There's at least a bucket's worth of the kind of tumbled junk you get in museum gift shops in here. At least he was present to watch the stuff get dug up in this case.