metalsmith
Cave Dweller 
Member since October 2012
Posts: 1,537
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Post by metalsmith on Mar 22, 2017 1:01:53 GMT -5
@shotgunner Now that's nice. Sorry, I mean that's gneiss: Garnet Gneiss. Look on the bright side at least it isn't shist.  Similar things going on here:  See here  I will adjust (/correct) myself... This sample reminds me of a garnet (I was thinking 'schist') at Scourie in Scotland I encountered many years ago. So, just checking up - I have some around somewhere - I discovered that is considered to be a granulite ( see the facies diagram here). Depending on the tectonic setting of your sample, this might also apply, particularly since, what was bugging me, is the mineralogy of your piece doesn't appear to have much by the way of structure which gneiss tends to have and hence by the degree of melt you had identified it as granite. You might have to dig around, do some research or speak to local geological authorities (museum / university) to confirm, but yes, I thought 'granulite' might add to the possibilities here. |
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Post by radio on Mar 22, 2017 8:03:30 GMT -5
Weird material. I'm afraid I'm no help with an ID. I have done a lot of prospecting and hounding in Gold country all around the Merced River to Sonora areas, but can't recall seeing anything like that. Would love to see some cabs from it!
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,726 
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Post by Fossilman on Mar 22, 2017 11:02:16 GMT -5
WOW! That is a beautiful piece of material!!!
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Post by vegasjames on Mar 25, 2017 1:29:17 GMT -5
I agree with garnet gneiss. Have a lot of it and garnet schist, garnet amphibolite, garnet anorthosite and garnet in quartz around here. Was just out yesterday in the area and brought back a few pieces of the garnet gneiss.
Also found a really cool garnets in blue quartz. Seen a lot of garnets in the white quartz, but never the blue.
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 25, 2017 9:54:54 GMT -5
I agree with garnet gneiss. Have a lot of it and garnet schist, garnet amphibolite, garnet anorthosite and garnet in quartz around here. Was just out yesterday in the area and brought back a few pieces of the garnet gneiss. Also found a really cool garnets in blue quartz. Seen a lot of garnets in the white quartz, but never the blue. This material has native metal in it too. ETA I Google gneiss. Gneiss is a metamorphic granite. With stripes. Nothing about this is striped. |
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Post by vegasjames on Mar 25, 2017 14:48:27 GMT -5
I agree with garnet gneiss. Have a lot of it and garnet schist, garnet amphibolite, garnet anorthosite and garnet in quartz around here. Was just out yesterday in the area and brought back a few pieces of the garnet gneiss. Also found a really cool garnets in blue quartz. Seen a lot of garnets in the white quartz, but never the blue. This material has native metal in it too. ETA I Google gneiss. Gneiss is a metamorphic granite. With stripes. Nothing about this is striped. You can see the lines in the first pic. |
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Post by snowmom on Mar 26, 2017 6:01:03 GMT -5
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Post by 1dave on Mar 26, 2017 7:37:54 GMT -5
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 26, 2017 10:00:49 GMT -5
Could be auriferous i suppose, but defiantly not schist. Good to see you back. |
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metalsmith
Cave Dweller
Member since October 2012
Posts: 1,537
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Post by metalsmith on Mar 26, 2017 12:44:18 GMT -5
I agree with garnet gneiss. Have a lot of it and garnet schist, garnet amphibolite, garnet anorthosite and garnet in quartz around here. Was just out yesterday in the area and brought back a few pieces of the garnet gneiss. Also found a really cool garnets in blue quartz. Seen a lot of garnets in the white quartz, but never the blue. This material has native metal in it too. ETA I Google gneiss. Gneiss is a metamorphic granite. With stripes. Nothing about this is striped. That is why I suggested Granulite; the rock endures virtually complete melting & recrystallisation. Tectonic pressure causes the alternation of foliate and granulitic textures in gneiss (gneissose texture); the foliation is absent in granulite. |
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Hobo's Dad
off to a rocking start
Member since March 2017
Posts: 20
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Post by Hobo's Dad on Mar 26, 2017 18:33:10 GMT -5
Can't wait to see that stuff polished. Is jeannie gonna cab it? |
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Mar 26, 2017 18:40:48 GMT -5
Can't wait to see that stuff polished. Is jeannie gonna cab it? Ya have to asked her! Well, i guess u already did sorta. |
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Post by Rockoonz on Mar 26, 2017 19:02:52 GMT -5
So I gather you're not taking it for granite. Could be Gneiss Definitely not Schist  |
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jeannie
spending too much on rocks
Member since January 2017
Posts: 266 
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Post by jeannie on Apr 1, 2017 20:40:59 GMT -5
Can't wait to see that stuff polished. Is jeannie gonna cab it? yes I am!!!😊 |
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Hobo's Dad
off to a rocking start
Member since March 2017
Posts: 20
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Post by Hobo's Dad on Apr 2, 2017 22:52:53 GMT -5
Can't wait to see that stuff polished. Is jeannie gonna cab it? yes I am!!!😊 Good! |
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