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Post by arghvark on Aug 6, 2018 11:06:37 GMT -5
NW Nevada. Only piece of this I found in about an hour of stumbling around one localized area. Float is highly mixed. Some small pieces of jasper, lots of low-quality, water-rounded pet wood. There is another area about 30 miles from this site that has a lot of this, but not as shiny or as stratified. I'll try and hack off the end later today. Like this stuff, 'cause green. Thinking this might take a nice shine. ID help? Thanks for looking. ?: Generated from my Samsung GALAXY S5 using tools.rackonly.com
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Post by arghvark on Aug 6, 2018 11:07:11 GMT -5
Photos come out crappy.
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Post by rockpickerforever on Aug 6, 2018 11:46:36 GMT -5
NW Nevada. Only piece of this I found in about an hour of stumbling around one localized area. Float is highly mixed. Some small pieces of jasper, lots of low-quality, water-rounded pet wood. There is another area about 30 miles from this site that has a lot of this, but not as shiny or as stratified. I'll try and hack off the end later today. Like this stuff, 'cause green. Thinking this might take a nice shine. ID help? Thanks for looking. ?: Generated from my Samsung GALAXY S5 using tools.rackonly.comLooks kind of schisty. Is it crumbly?
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Post by arghvark on Aug 6, 2018 13:39:34 GMT -5
Very solid, but it may break more easily between the striations.
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Post by arghvark on Aug 6, 2018 18:05:03 GMT -5
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,687
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Post by NRG on Aug 10, 2018 0:38:39 GMT -5
Doesn't look even remotely green on my OLED phone. Looks black with lighter areas.
Edit:
"Much harder than obsidian, but softer than agate".
Lemme rephrase
"Much harder than Mohs 5.5, but softer than Mohs 6.5."
I can't parse this.
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Post by arghvark on Aug 11, 2018 2:18:44 GMT -5
Well, based on my limited experience banging on, cutting, grinding, and tumbling rocks, from a purely practical perspective it seems there's quite a large difference in hardness between obsidian and agate. Regardless of whether we're talking about a difference between 5.5 and 6.5, or 5 and 7, or 5-6 and 6.5-8 on a scale that is fairly qualitative in nature. "Between obsidian and agate in hardness, but closer to agate" seems fair, howzat?
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Post by arghvark on Aug 19, 2018 10:11:13 GMT -5
Based on some stuff I read and a discussion with a geologist friend who showed me some samples in different forms, I think this might be a non-crystalline form of epidote?
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Post by Peruano on Aug 20, 2018 6:19:49 GMT -5
Its metamorphic and falls into a now obsolete term that used to be in play a lot: "greenstone". The term was applied to a spectrum of rocks hard to identify and blending between greens and blacks. Read up on green stone and be a bit confused.
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Post by arghvark on Aug 21, 2018 10:10:20 GMT -5
Its metamorphic and falls into a now obsolete term that used to be in play a lot: "greenstone". The term was applied to a spectrum of rocks hard to identify and blending between greens and blacks. Read up on green stone and be a bit confused. "Greenstone", I like it! Will read up.
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