Crystal

You may want to try /an/ too.

I'm not sure. Does that brown stuff wash off?

If not, is that brown section fully opaque if you put a flashlight behind it?

I was gonna say quartz but I've never seen it in a hex shape

>>900668
Brown stuff appears to be the matrix and is as hard, if not harder than the crystal.

>>900764
Yeah i thought that too

>>900663
Its a mineral Marie.

Geology major here,

No fucking clue....

>>900663
>I found it in Visoko, Bosnia and Hercegovina
You found it in all three of those places... or??

>>900899
Huh

>>900899
american education?

Quartz.

http://geology.about.com/od/minerals/a/aboutquartz.htm

>>900899
visoko is a place in the country of bosnia and herzegovina, moron

>>900874
Yep... Like I said... Nobody can figure it out.. First thought is quartz, but havent seen a quartz look this way before.

>>900955

Mineral fan here (not mineral pro) and I don't think it looks like any variations of quartz I have seen.

Right it's some variant of Amythest (word needed)

>>900663
Looks like some weird olivine. Does it scratch copper or glass? Will it dissolve in contact with acid?

>>900663
Limestone

>>900663
It's kebab

>>900663
calcite

>>900663
Fluorite? what's the hardness, give us a chance here

>>901189
Nvm this guy is probably right