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Post by pegmatite on Sept 1, 2007 21:46:50 GMT -5
Had to get out today and look at some rocks or go nuts, so I decided to visit some favorite road cuts near home. Today I lucked upon this crystal lined cavity in addition to the usual micros. This is a new mineral for me at this site. I believe it may be aragonite.  Steve |
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Post by genchaos on Sept 3, 2007 11:16:11 GMT -5
Sorry, I'm not an expert, but it does look like some of the hemimorphite we find out here. Regardless of my ignorance, I do know what I like. Great specimen!!
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Post by pegmatite on Sept 3, 2007 17:23:12 GMT -5
Appreciate the look and suggestion. I was hesitant to mess with it much for testing, but did find a lose crystal on another specimen which I have been able to test. It's definitely a carbonate based on an acid test and given what's known from the site (Owingsville, Kentucky) aragonite seems to be the most likely suspect. It was found associated with the ferroan variety of dolomite and I have since found some pretty good look-alike photos on Mindat.com with the same general associates. Turns out it is also strongly fluorescent in long-wave uv light (white).
Steve
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Post by genchaos on Sept 5, 2007 11:48:08 GMT -5
Out of curiosity, how close is that photo to actual size?
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Post by pegmatite on Sept 5, 2007 16:31:18 GMT -5
The visible portion of the cavity (it extends all the way through the specimen) is about 1.5 cm x 2 cm, with the longest crystals being a little over 1 cm long.
Steve
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