What is this stuff? Looks like glass!

[Justgold]

Hi can someone tell me what's up with this stuff? Where I ride my dirtbike I see this every once in a while, it looks like a volcano of glass that just froze in time coming out of some red clay hills.. so I broke this big chunk off an brought it home to find out what it is.. it's really heavy I know that.. thanks in advance.

 

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[fyrffytr1]

Looks like quartz to me.

 

[Justgold]

Really? It's like glass but kinda brittle at some spots. I should go take a pic of the weird veins of it that shoot out of these hills. I don't think it's quartz but maybe... I don't know.. is there something else it could be?

 

[Mine Shaft]

Reminds me of "Mica"Look up Mica mineral.

 

[Justgold]

I think it is gypsum! That's what it was.. sound right or no?

 

[Red-Coat]

From the splintery fracture (close up from your pic below) and cleavage planes seen, it looks like it might be selenite:

 

[Red-Coat]

I think it is gypsum! That's what it was.. sound right or no?

Your post crossed with mine. I think so too. Selenite is a distinct crystal form of gypsum.

 

[old digger]

It is Gypsum as ''jhunt'' has suggested. It is rather common out here in the western states.

 

[GoldieLocks]

This might help:

https://www.nevadamining.org/minerals-in-nevada/

 

[Back-of-the-boat]

Gypsum, I find it out in the Tumey hills here in California it is real close to the fault line, so a lot of different minerals are in the area including asbestos and cinnabar.