drdrew
noticing nice landscape pebbles
Member since September 2010
Posts: 85
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Post by drdrew on Oct 17, 2010 15:22:03 GMT -5
so after a month or so of looking for good rough around here today i happened across something that looks really completely different from anything else i've seen around here...so before i take the hammer to it i thought i'd ask if it was anything extra special?
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Post by gr on Oct 17, 2010 17:52:48 GMT -5
If you could post a little more info about it, one of the members could probably tell you what you have. Sure would make some pretty cabs! Do you have acess to a saw for slabs? How thick is it, Is it pretty hard. Looks like it would make some real pretty tumbled stones too. I'd look around for more. Gary
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chromenut
fully equipped rock polisher
Member since December 2009
Posts: 1,971
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Post by chromenut on Oct 17, 2010 17:59:56 GMT -5
I don't know what that is unless maybe striated sandstone. How hard is it? Have you tried the scratch test yet? I can't tell from the photo but to me it looks a bit porous, which means a softer stone that may not take to well to a polish, but again from the photo it's really impossible to tell.
If that's a hard stone, that will make some lovely cabs!
Also if you could mention what part of the state you found this and an estimate at what altitude, we can at least look up the geology of that region and find out what generally runs through there. I've tried finding that by visual reference but there are so many types that are striated like that, it could take me a month to search visually through all the photos of rock types.
Also, can you take a picture of that end-on? The flat face shows us the mixture but I'd like to see what the other end shows. Also on the break-off point, do you see any crystalline structures?
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Post by tandl on Oct 17, 2010 19:38:33 GMT -5
You found it ,where
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,466
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Post by Sabre52 on Oct 18, 2010 8:24:47 GMT -5
Not knowing the where or hardness makes it tough but I'd say it looks like wonderstone-type rhyolite to me, at least if you're hunting somewhere in the west (Wonderstone is not uncommon in Texas, New Mexico, CA, and especially Nevada and Utah) If you're in limestone country, it could be a flint or chert variant.....Mel
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chromenut
fully equipped rock polisher
Member since December 2009
Posts: 1,971
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Post by chromenut on Oct 18, 2010 17:33:12 GMT -5
Does look sort of like a limestone matrix. Wonder if it cracks up when hammered....
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Post by johnjsgems on Oct 18, 2010 21:39:44 GMT -5
I was guessing a rhyolite also. Some are too porous to polish.
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drdrew
noticing nice landscape pebbles
Member since September 2010
Posts: 85
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Post by drdrew on Oct 25, 2010 9:53:10 GMT -5
hi guys...sooooo sorry i am not ignoring your helpful responses! i guess i should not post a question then go on vacation...it seems very rude now that i look back. this is in central missouri. mostly found with lots of chert. i have a lot of banded chert that i am tumbling, but this does seem different. it is dense feeling, more dense than limestone...scratch test....i can't scratch it with my fingernail...what else should i try to scratch it with?
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Post by tandl on Oct 25, 2010 10:25:42 GMT -5
Try the chert against it .
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drdrew
noticing nice landscape pebbles
Member since September 2010
Posts: 85
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Post by drdrew on Oct 25, 2010 15:12:16 GMT -5
will do.
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
Posts: 20,466
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Post by Sabre52 on Oct 25, 2010 16:00:52 GMT -5
If it's from Missouri, hard etc. probably is Mozarkite which is banded like that sometimes and is a quartz family mineral in the flint/chert group....Mel
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Post by Hard Rock Cafe on Oct 25, 2010 17:05:13 GMT -5
You can also try scratching it with a steel knife blade, a metal file, and a quartz point. It doesn't look like it has a waxy luster in the photo...
Chuck
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