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Identity HelpSpecimen/Locality ID (4)

11th Aug 2010 01:31 UTCMonica Ceretti

02756260016029289196121.jpg
Copyright © mindat.org
Hello again,


This specimen appears to be a mix of sparkly white nodules (my camera failed to capture the sparkle), flat chalky-looking nodules, and transparent crystals. It weighs 5 3/4 oz and measures approx. 3 1/4" x 2 1/2" x 1 3/4". Any ideas regarding ID/locality?


My sincere thanks.

M.

03182120016029289192355.jpg
03769650016029289198519.jpg

11th Aug 2010 03:18 UTCNoah Horwitz

Looks like calcite or possibly aragonite. Probably too many possible localities to attempt a guess. The difference between the chalky and crystalline areas is likely just in the size of the crystals.

18th Aug 2010 09:47 UTCLefteris Rantos Expert

Do you have dilute HCl acid for tests? Calcite and Aragonite will fizz vigorously in HCl. They even slowly dissolve (with barely discernible fizzing) in common vinegar. You could try to run these simple tests first.


Lefteris.
 
and/or  
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