Found in a river on a mountain
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.
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
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. 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.
Philosophy of Science student here. That's a tear from a rock giant.
>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?
diamond is basically graphite though, innit? both are carbon
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
captain planet here, thats my left testicle, lost it last week in battle
RIP in peace, Lefty
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.