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Can anyone tell me what this is?

0 votes

I'm trying to figure out what this is. I have been overwhelmed with all the info online. I'm very interested in rocks/ minerals. My friend in middle georgia is clearing some Land and I had to go see what was being unearthed! There is a fault on property Part is biotite gnesis/feldspathic biotite gnesis and the other is mica schist/gnesis/amphibolite This is 1 of many I'm trying to identify. Thanksalt text

alt text

asked Feb 13, 2014 by rdp30052 (180 points)

4 Answers

0 votes

The white definitley looks like a feldspar, and the grey is probably quartz. Are there any other pieces with mica visible?

answered Feb 13, 2014 by hershel (47,740 points)
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This is same rock from different angles. I do see some mica. Would this be called a conglomerate?alt text

![alt text][2]

![alt text][2]

answered Feb 13, 2014 by rdp30052 (180 points)
0 votes

No, conglomerate has rounded (weathered) stones cemented together by later geologic processes. This specimen is almost certainly from a pegmatite or vein, igneous in origin.

answered Feb 15, 2014 by granitegneiss (140 points)
0 votes

I agree. This is from a pegmatite in the metamorphic rocks you have described. Pegmatites have larger crystals that the rock that surrounds them because they cooled slower. Conglomerate is a sedimentary rock made up of ROUNDED rocks and minerals bound together with sand and cement (emphasis added). Georgia is well known for the igneous and metamorphic rocks in the NW part of the state. Gold was found in the 1840s near Daloniga (SP?) an hour N of Atlanta.

answered Feb 25, 2014 by stonesinger (720 points)

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