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Post by knave on Aug 14, 2020 0:44:27 GMT -5
Really appreciate the help. Seems like a softer rock... Calcite in Basalt matrix?
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Post by rmf on Aug 14, 2020 9:55:01 GMT -5
hardness? Basalt with quartz, marble with calcite
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Post by knave on Aug 14, 2020 10:17:13 GMT -5
hardness? Basalt with quartz, marble with calcite The gray is mohs 5 or so like basalt. The white could be quartz.
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AzRockGeek
has rocks in the head
Member since September 2016
Posts: 682
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Post by AzRockGeek on Aug 14, 2020 10:53:17 GMT -5
Reminds me of Michigan lightning stone, different matrix though.
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fuss
spending too much on rocks
Member since October 2018
Posts: 252
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Post by fuss on Aug 16, 2020 11:10:31 GMT -5
Any idea where these are from? a close up or at least a larger file that can be zoomed in on would also be helpful.
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Post by knave on Aug 16, 2020 11:19:16 GMT -5
Any idea where these are from? a close up or at least a larger file that can be zoomed in on would also be helpful. I don’t know the source. I got them with a saw purchase. I can upload a larger picture.
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Post by knave on Aug 16, 2020 11:21:37 GMT -5
When they are dry it’s a matt finish on the matrix. Likely basalt.
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fuss
spending too much on rocks
Member since October 2018
Posts: 252
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Post by fuss on Aug 16, 2020 15:38:34 GMT -5
No, not basalt, the grain size is to large. These appear to be metamorphic possibly a gneiss variety. Thx for uploading the larger file was helpful.
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Post by knave on Aug 17, 2020 18:17:29 GMT -5
Thanks for the help everyone!
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lookatthat
Cave Dweller
Whatever there is to be found.
Member since May 2017
Posts: 1,360
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Post by lookatthat on Aug 18, 2020 14:37:30 GMT -5
Looks like partly metamorphosed limestone from here.
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