Is this quartz or glass?

>>665515
Looks like glass to me.

Its river glass. Broken pieces of glass that gets polished by the water over time till its smooth. I have a jar of it from my childhood.

>>665515
I'm leaning towards quartz because of the amount of conchoidal fracturing. A sure way to test is by actually scratching it on glass. Quartz has a hardness of 7, glass is 5.5. I took an intro to geology class.

>>665523
As in, if it scratches the glass easily, it is probably quartz.

>>665524
Hmm good idea thank you. I found it by a bunch of other small pieces of quartz so it might be

>>665515
Looks like glass desu senpai

>>665523
Glass fractures in the same way, the hardness test is the best way to tell them apart.

>>665515
Aren't quartz and glass both silicon dioxide? I think the only difference is whether it crystallized or was melted.

>>665815
I think quartz has a much more consistent and symmetrical crystal structure, and glass is completely random. Also man made glass almost always has other ingredients added to the SiO2 that lowers the hardness. I believe glass is about 80% SiO2

>>665815
Completely different materials desu senpai

>>665914
Correct. The best way, as stated earlier, is to try to scratch glass with it. Also, you'd find it with other quartz pieces, or at least in an area where granite or another felsic rock is weathering

Geology student here. That's definitely not quartz lol. No cleavage son.

>>666846
Geology student here. Quartz can, and often does, have chonchoidal fracturing. A peice of glass in a river that has been eroded like this wouldn't be shiny and clear looking. Look at any river and beach glass that is natural. 99.9 percent of the time it will be scratched up to the point where it is cloudy. Quartz on the other hand, will have fracturing without the presence of scratches.

>>666969
Damn son you just out geology-ed me. Gneiss!

Someone who has an actual geology degree here, it's glass, i have quartz from multiple places across US never found a quartz like that

>>666846
> student

>>666969
> student

>>667148
> graduate

>>665515
Nursing student here, fuck your pebbles nigga.

>>665515
Casual rock hound here. That's quartz

Thats a fucking diamond!

Tathz no diamond dipshit......

Rock here, thats my freind, you kidnapped him!

Ooh heeeell yes its a diamond. Its either that or an ice cube. Trust me, I know this. I fint know nothn bout geology but I do know my rocks.

>>665515
if it's quartz it will throw sparks from steel

it is a quartz

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>>665515

Philosophy of Science student here. That's a tear from a rock giant.

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>>667363
the poor thing

>>667158
>Claims made on the internet

It's fairly hard to tell the two apart without a hardness test, OP. There's no cleavage to look for, as neither have defined cleavage angles. The anon talking about weathering granites has the right idea, though. What kind of terrane is your stream in? Any plutonic rocks in the area, or a ways upstream?

OP fucking scratch it against glass already

>>667148
What kind of work do you do? I recently changed my major to Geology

Quarts is basically glass though, innit? Both are silica.

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>>667559
diamond is basically graphite though, innit? both are carbon

>>665515
It isn't quartz

This thread pisses me off

>>668305
well what the hell waddled up to your creek and took a dump >:|

>>665515
Geo grad here.

Test it by scratching it against glass, quartz is harder and it'll be easy.

Or look for little round bubbles in there (glass is more likely to have near perfect bubbles. Quartz is a better conductor of heat too.

Looks like glass to me tho nigga

>>666846
>>666969
pharmacy technician here, you're both wrong.

>>668605
UPS driver here, that's glass nigga.

>>669030
>>669019
>>668605
Feminist dance therapy major here, it's the crystallized tears of oppressed women everywhere.

>>667662
Correct. One way to tell them apart is to do a hardness test, much like glass/quartz

>>669051
what's your occupation?

>>669058
deodorant tester in Axe's QC center

Women's studies 1 grad here

It doesn't matter what it is necause the patriarchy is still afoot

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>>669063

>>669058
masturbation inspector

>>666846
>>666969
>>667148
>>667158
Geology PhD ScD tenured professor here. It's a very rare kind of diamond with radial symmetry internal cross-section lattices.

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captain planet here, thats my left testicle, lost it last week in battle

RIP in peace, Lefty

>>668306
>waddled into
ftfy

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>>670679
up to i says

>>667396
This

This is the best thread on /out/ in weeks, and it's about a fucking rock.

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>>670710
But it wasn't a rock......

>>665515
Potter/glassblower here. Looks like glass to me. No crystalline structure, no mineral inclusions, round air bubbles, no cleavage. Raised surfaces are more matte, indents are glossy with ripple pattern consistent with impact break of amorphous structured vitreous glass. Probably transparent soda lime bottle glass made in the last 50 years.

>>670727
very reddit tier comment

>>669051
Holy shit, this reply did it for me. My sides are shakin'