jasonshort
starting to spend too much on rocks
Member since June 2019
Posts: 113
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Post by jasonshort on Sept 13, 2019 19:50:56 GMT -5
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jasonshort
starting to spend too much on rocks
Member since June 2019
Posts: 113
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Post by jasonshort on Sept 13, 2019 23:04:42 GMT -5
Could it be aventurine or jadeite?
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,676
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Post by Fossilman on Sept 14, 2019 8:31:48 GMT -5
Or green Quartz...
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jasonshort
starting to spend too much on rocks
Member since June 2019
Posts: 113
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Post by jasonshort on Sept 14, 2019 11:45:34 GMT -5
I think I lest out that the rock is from montana
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 14, 2019 13:19:51 GMT -5
Could be amazonite. Mindat only shows one location in Montana for that (west of Butte), not that there might be others. If you can do a scratch test to give an approximate hardness, that might help narrow down what it may be. The Mohs hardness for amazonite is 6.
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jasonshort
starting to spend too much on rocks
Member since June 2019
Posts: 113
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Post by jasonshort on Sept 14, 2019 15:44:05 GMT -5
I scrached it with a kitchen knife and got a while line. Not sure how to tell if it is a 6
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hh5
starting to spend too much on rocks
Member since January 2012
Posts: 136
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Post by hh5 on Sept 16, 2019 18:52:40 GMT -5
I recently saw some calcite that looked similar. Put a drop of vinegar on a spot of the rock and see if it bubbles. I had to use a magnifying glass to see the bubbles.
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Post by rmf on Sept 16, 2019 21:41:45 GMT -5
If you scratched it with a knife then it is not quartz, jade, quartzite or amazonite. I would say serpentine.
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,630
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Post by NRG on Sept 20, 2019 14:35:44 GMT -5
Looks like a mudstone to me.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 20, 2019 20:19:58 GMT -5
Depends on the hardness of the knife (range from 5-6.5) the harder of which can scratch amazonite (Mohs 6). The suggestion by hh5 to test with vinegar see if it bubbles (limestones, calcite, apatite, etc.) is a good one. If you don't know the hardness of your knife, try using known rocks from the list at the that link to narrow things down.
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thedude
off to a rocking start
Member since November 2019
Posts: 5
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Post by thedude on Nov 26, 2019 11:20:00 GMT -5
Fuchsite.
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