Crystalline aggregate of niter, label indicates locality is the poorly specified "Buffalo River Valley". There are many caves in this region that could have been the source for this sample; these were worked at least up to 1863 (The Encyclopedia of Arkansas History & Culture).
1 cm sample. S402-153
Excalibur Mineral Company specimen.
1 cm sample. S402-153
Excalibur Mineral Company specimen.
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Photo added: 20th Jan 2008