ryan
starting to spend too much on rocks
Member since October 2016
Posts: 185
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Post by ryan on Jul 31, 2017 12:52:24 GMT -5
Hello fellow stoners is anyone familiar with diorite that looks almost like snowflake obsidian? flic.kr/p/WG8CAu ryan
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,681
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Post by Fossilman on Aug 1, 2017 8:45:26 GMT -5
I find green jasper like that too...............
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Aug 1, 2017 10:15:39 GMT -5
Why not have Chinese writing stone that has snowflakes instead of kanji?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Aug 1, 2017 14:10:14 GMT -5
Interesting find. I've seen some granodiorite and dacite that had orbicular inclusions which looked a lot like your pieces. Same process forms the "snowflakes" in obsidian (cristobalite in that case) and crystals in dacite. Can be pretty when polished.
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Post by orrum on Aug 1, 2017 15:30:37 GMT -5
You can also get ash pockets in obsidian!!!
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,456
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Post by Sabre52 on Aug 1, 2017 15:39:25 GMT -5
Hey that's pretty cool! Now you've got to cut an polish a cab from it.Looks like it has possibilities. We get some rhyolite in the Rio gravels that has a very similar snowflake look to it too.....Mel
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Aug 2, 2017 18:06:23 GMT -5
Interesting find. I've seen some granodiorite and dacite that had orbicular inclusions which looked a lot like your pieces. Same process forms the "snowflakes" in obsidian (cristobalite in that case) and crystals in dacite. Can be pretty when polished. Actually the snowflake in snowflake obsidian were recently tested by IR reflectance spectroscopy as feldspar. I have an email from the researcher regarding these results. Makes perfect sense. Obsidian is glassy granite. Snowflake cooled fast enough to be mostly glass, but slow enough for the feldspar component to crystals.
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