rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Feb 1, 2020 13:10:50 GMT -5
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Post by Drummond Island Rocks on Feb 1, 2020 15:19:48 GMT -5
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Feb 1, 2020 16:00:55 GMT -5
Yours is better and more pockets of green!  thanks |
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Post by joshuamcduffie on Feb 1, 2020 20:07:07 GMT -5
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Post by rmf on Feb 2, 2020 22:51:37 GMT -5
as far as the lighter and darker green. Epidote is the lighter and larger green. the smaller and darker could be larger crystals of epidote or possibly an Iron silicate like glauconite
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Feb 4, 2020 19:32:41 GMT -5
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Apr 10, 2020 9:07:08 GMT -5
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 10, 2020 11:14:08 GMT -5
Found a cool cousin of the first rock in the original post in my landscape rocks. You might want to cut and polish a window on that to see if the green pockets have iridescence/acicular structure. I've seen small chlorastrolite ("Isle Royale Greenstone") inclusions with pink thomsonite, datolite, etc. from such amygdaloidal basalt pieces from the UP - not sure if it can occur elsewhere in the state. |
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rockstock
spending too much on rocks
Member since April 2019
Posts: 472
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Post by rockstock on Apr 10, 2020 11:17:45 GMT -5
Found a cool cousin of the first rock in the original post in my landscape rocks. You might want to cut and polish a window on that to see if the green pockets have iridescence/acicular structure. I've seen small chlorastrolite ("Isle Royale Greenstone") inclusions with pink thomsonite, datolite, etc. from such amygdaloidal basalt pieces from the UP - not sure if it can occur elsewhere in the state. I will do that, is a window better than cutting it in half? Is the pink one of those two things? Thanks |
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Post by fernwood on Apr 10, 2020 12:58:50 GMT -5
Nice finds. I have pieces of amygdaloidal basalt with pink, green and a combo of both.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Apr 10, 2020 14:18:09 GMT -5
I will do that, is a window better than cutting it in half? Is the pink one of those two things? If this will just be a specimen, then a window would work better IMO (would make a flat place to use as a base). Cut it anyway you wish if you are thinking of cabbing, though. The pink could be thomsonite (which is what I've seen), datolite or some other mineral. There are also possibilities other than chlorastrolite for the green (including, but not limited to datolite and thomsonite) - which is why I'd want to cut and sand/polish a surface to better examine the structure details under a loupe or other magnification. |
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Post by RocksInNJ on Apr 12, 2020 8:29:35 GMT -5
Very cool finds. Looking forward to see what you do with them.
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Post by toiv0 on Apr 12, 2020 16:34:34 GMT -5
I will do that, is a window better than cutting it in half? Is the pink one of those two things? If this will just be a specimen, then a window would work better IMO (would make a flat place to use as a base). Cut it anyway you wish if you are thinking of cabbing, though. The pink could be thomsonite (which is what I've seen), datolite or some other mineral. There are also possibilities other than chlorastrolite for the green (including, but not limited to datolite and thomsonite) - which is why I'd want to cut and sand/polish a surface to better examine the structure details under a loupe or other magnification. The thomsonite from the UP is usually Prehnite. Easy to confuse the two. I might even likethe Prehnite better than the Thomsonite. |
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dreamrocks
fully equipped rock polisher
I got lucky this morning and was able to post this no others since
Member since November 2018
Posts: 1,232
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Post by dreamrocks on Apr 13, 2020 0:27:08 GMT -5
Do you have a black light I have seen stones like #5 fluoresce really nicely sometimes even with a mixture of colors
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