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Post by Jugglerguy on Feb 17, 2012 21:30:55 GMT -5
I just took my second batch out of the Lot-O. I attempted to put in mostly local quartz, but I'm not great at identifying rocks yet. I think one piece is quartzite and there's a purple rock that isn't quartz, but I'm not sure what it is. It's not a perfect batch, there are some fractures and other problems, but I'm generally pretty happy with it. Attachments:
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Post by Jugglerguy on Feb 17, 2012 21:32:59 GMT -5
I'm not sure what this rock is. I cut it up with an angle grinder. I think the speckles are small pits, not a feature of the rock. Attachments:
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Post by Jugglerguy on Feb 17, 2012 21:36:30 GMT -5
Here's the purple rock before tumbling. Any idea what this is? Attachments:
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Post by Jugglerguy on Feb 17, 2012 21:37:05 GMT -5
I think this is quartzite. Attachments:
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Post by Jugglerguy on Feb 17, 2012 21:37:43 GMT -5
Another rock: Attachments:
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Post by Jugglerguy on Feb 17, 2012 21:38:11 GMT -5
Last one: Attachments:
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Post by paulshiroma on Feb 18, 2012 2:37:34 GMT -5
Looks pretty good! I'm with you, though, I'm not very good at identifying rocks. My boys and I tend towards the "if it's a pretty rock take it" . Yours came out great! Paul
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Post by tandl on Feb 18, 2012 10:36:11 GMT -5
i just recently discovered that not all those quartz rocks are quartz, some are feldspar-orthoclase moonstone-plagioclase sunstone and granite . check when dry, shiller of the feldspar shows better . the purple looks like orthoquartzite, or arkose feldspar -sandstone
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Post by Jugglerguy on Feb 18, 2012 11:02:48 GMT -5
Tandi, I don't understand most of what you just said, but I'll start studying! Isn't sandstone really crumbly? My purple rock was rotary tumbled for almost a month in 60/90, 10 days in 120/220 then about a week in a vibratory tumbler. It only developed the speckles in the last stages of the vibe tumbling. It seems to be a pretty hard rock.
I really liked the pictures you posted the other day. It's fun to see the stuff you found in Illinois because I find some of the same stuff in Michigan. There were some cool rocks I haven't found here though, so I'll have to start looking harder!
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Post by tandl on Feb 18, 2012 11:16:37 GMT -5
sandstone is crumbly. Arkose is small pieces of feldspar recemented . it can be very good solid material. if you dont have a rock book, type arkose in google, i think you will find it interesting. Michigan and illinois rocks are similar glacial deposits
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Post by tandl on Feb 18, 2012 11:17:53 GMT -5
your orange rock looks like granite. can you see shiller ?
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Post by Jugglerguy on Feb 18, 2012 12:02:29 GMT -5
I don't know what shiller is, so I'm not sure if I can see it. I tried looking it up, but I found nothing. Could you define it for me? I was told that granite always has mica in it. I don't see any mica in the orange rock.
I'll do some studying on arkose.
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Post by tandl on Feb 18, 2012 13:08:41 GMT -5
essentially -granite is feldspar and quartz. often has mica, and many other minerals can be a part. Arkose is similar looking . Shiller is a shiney flash , from the cleavage of the feldspar.
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Post by Drummond Island Rocks on Feb 18, 2012 21:28:31 GMT -5
Looks like you guys got a great shine on those. Its cool to see some local finds all smooth and shiny. Chuck
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