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Deleted
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Post by Deleted on Aug 12, 2014 6:08:27 GMT -5
I'm under the assumption that this was some sort of glass blowers slag, which the glass blower created these swirls.. just for aesthetics.
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Post by snowmom on Aug 12, 2014 6:29:14 GMT -5
well the stuff is absolutely beautiful. looks like some sort of tube agate or botroidal stuff... somebody here will be able to give it an ID... did you hound that or? tell us the story?
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Sabre52
Cave Dweller
Me and my gal, Rosie
Member since August 2005
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Post by Sabre52 on Aug 12, 2014 8:25:32 GMT -5
On the California desert those are called "desert roses". They are a chalcedony formation very similar to those that contain fire agate except without the metallic goethite that yields the iridescence of fire agate. Not to be confused with the barite or calcite roses which are something different. In my "ute" as some would say, you could pick up buckets of those on the eastern Mojave Desert out towards Needles. Google "chalcedony rose" for more info or pics....Mel
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transcendental
spending too much on rocks
Member since June 2014
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Post by transcendental on Aug 12, 2014 8:29:48 GMT -5
What ever it is its beautiful! Looks pearlescent, is it?
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Deleted
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Post by Deleted on Aug 12, 2014 8:40:28 GMT -5
Great Info Mel.. I've always though Desert Rose was selenite.. and never knew that a chalcedony Rose existed.
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Sabre52
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Me and my gal, Rosie
Member since August 2005
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Post by Sabre52 on Aug 12, 2014 9:16:55 GMT -5
Whisper: Yup, a lot of minerals that have bladed crystals form rosette (rose) shaped crystal clusters too. Gypsum is one of those, as are calcite and barite. The famous Oklahoma ones are barite I think. I have a really pretty pink, quartz druze covered, calcite rose inside a broken Hauser beds geode in my collection and I'd sure call it a "rose". Used to love it when my pop would stop on the desert on the way to Oklahoma so I could hunt chalcedony desert roses. Way back then, they were everywhere out there and some were huge too.Desert rock shops used to sell magnificent examples for 10 cents each/ 12 for a dollar. I had hundreds. Now I don't even have one in my collection. Donated my last batch to the VGMS gem show silent auction *L*. Pyramid Lake, Nevada used to have tons of magnificent gypsum or calcite examples back in the 1970's.....Mel
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vugs
starting to spend too much on rocks
Rockbiter
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Post by vugs on Aug 12, 2014 12:20:27 GMT -5
Yup chalcedony rose. I see alot of that in the California desert and off Kanan Rd. Some of them, when polished, show similar patterns to the brazillian Ocos agates (but not as nice). I've collected some pieces of blue chalcedony rose from the Kanan Rd area.
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gemfeller
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Post by gemfeller on Aug 12, 2014 22:19:13 GMT -5
Mel's comments about chalcedony roses and fire agate reminded me of this Deer Creek fire agate rough of mine. It doesn't have the complete milky chalcedony "cap" (rose) typical of many fire agates but you can see that one started to form through the same process that made the botryoidal structure of the brown (sard) fire agate.
I shot the bottom image "wet" in an attempt to show the truly fine and bright glow of a quality fire patch located just below the surface. I wasn't too successful but it's very much there in the middle and upper center of the stone. When I have the time I'll "liberate" that amazing beauty and should end up with a very pretty and valuable cut gem. You can see a "glow" in the center of the image and amazing orange/green hues continue up to the top.
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Sandy
noticing nice landscape pebbles
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Post by Sandy on Aug 13, 2014 1:23:22 GMT -5
I believe it is Chalcedony. I live in Santa Clarita, Ca. This was found in a wash which runs out to the desert. I have a few small pieces, I also tumbled a small piece just to add filler in my tumbler. Yes it is pearlescent. I had a larger dog that we used to walk in the wash.... We found all kinds of cool rocks. The other one I posted at the same time we found up there. Also a big chunk of what I believe to be Mahogany Obsidian. I was amazed at how polished it looked just picking it up. I know how much I like looking at pictures of rocks, so I'll try to get photos of both tomorrow and post them =)
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Fossilman
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Post by Fossilman on Aug 17, 2014 8:54:05 GMT -5
It is a chalcedony of some kind...Nice structure on that one!!
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