ubermenehune
spending too much on rocks
Member since March 2016
Posts: 293
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Post by ubermenehune on Aug 4, 2016 16:46:38 GMT -5
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Post by vegasjames on Aug 4, 2016 16:57:02 GMT -5
That soft and green could be serpentine with flecks of iron oxide. Location originally found can help to see if serpentine is in the area.
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ubermenehune
spending too much on rocks
Member since March 2016
Posts: 293
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Post by ubermenehune on Aug 4, 2016 17:02:36 GMT -5
I believe it was collected in Idaho or Oregon
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Deleted
Deleted Member
Member since January 1970
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Post by Deleted on Aug 4, 2016 17:59:02 GMT -5
Did you do an acid test?
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ubermenehune
spending too much on rocks
Member since March 2016
Posts: 293
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Post by ubermenehune on Aug 4, 2016 21:21:25 GMT -5
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Post by mohs on Aug 4, 2016 22:02:28 GMT -5
maybe you didn't try the right acid ?
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Post by Peruano on Aug 5, 2016 7:24:27 GMT -5
There is a whole family of rocks centered around serpentine, olivine, etc. and they are often lumped by the geologists as green stone, because the various combinations are numerous and complex. Serpentines can vary in hardness (or better said green stones) and hence may or may not be good tumblers depending on what you tumble them with. For me, nothing can beat the rich greens of well polished serpentines. Like Denny's restaurants its cheap, its available, why not?
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Aug 5, 2016 16:27:11 GMT -5
There is a whole family of rocks centered around serpentine, olivine, etc. and they are often lumped by the geologists as green stone, because the various combinations are numerous and complex. Serpentines can vary in hardness (or better said green stones) and hence may or may not be good tumblers depending on what you tumble them with. For me, nothing can beat the rich greens of well polished serpentines. Like Denny's restaurants its cheap, its available, why not? Specific gravity?
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Post by Peruano on Aug 5, 2016 17:24:58 GMT -5
Shotgunner (and others), I may have introduced unnecessary complexity to this thread, but I am convinced that many people call things serpentine, when they are actually dealing with a broad family of rocks called greenstone. A quick read of a good Nevada site nevada-outback-gems.com/Common_rocks/Greenstone.htm suggests that greenstone is a metamorphic form of a basalt which can span schistose forms with chlorite, actinolite, epidote, and serpentine or compact non schistose forms. Hornblende can even be involved. Probably whats important is that they are in areas of deep metamorphics (hence my finding them on the Rio Grande uplist/fault. But supposedly they are common in Michigan, and back east where old metamorphics are exposed. I couldn't find a hardness or specific gravity (probably because the terms spans so many gradations of rocks, but in my experience its soft and can crumble when cut if very schistose, but like the girl with the curl, when its good its very very good and polishes well. Another option to consider. Tom
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Post by vegasjames on Aug 5, 2016 19:19:14 GMT -5
Shotgunner (and others), I may have introduced unnecessary complexity to this thread, but I am convinced that many people call things serpentine, when they are actually dealing with a broad family of rocks called greenstone. A quick read of a good Nevada site nevada-outback-gems.com/Common_rocks/Greenstone.htm suggests that greenstone is a metamorphic form of a basalt which can span schistose forms with chlorite, actinolite, epidote, and serpentine or compact non schistose forms. Hornblende can even be involved. Probably whats important is that they are in areas of deep metamorphics (hence my finding them on the Rio Grande uplist/fault. But supposedly they are common in Michigan, and back east where old metamorphics are exposed. I couldn't find a hardness or specific gravity (probably because the terms spans so many gradations of rocks, but in my experience its soft and can crumble when cut if very schistose, but like the girl with the curl, when its good its very very good and polishes well. Another option to consider. Tom But this stone looks nothing like most of those rocks in the list, which narrows it down quite a bit. And being relatively soft narrows it down a lot further. The other possibility is chlorite, which again has many different types. But given the look, low hardness and location chloride schist is also a good possibility.
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ubermenehune
spending too much on rocks
Member since March 2016
Posts: 293
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Post by ubermenehune on Aug 6, 2016 0:26:39 GMT -5
I think we have a winner. You guys know your stuff. Much appreciated.
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