Ulexite
Boron, Kern County, California, USA
8.6 x 5.5 x 3.6 cm. Ulexite, an uncommon hydrated complex borate is famous from the evaporite deposits at Boron, which has produced numerous rare evaporite species. Few are as unusual as ulexite, also called "TV rock" for its fiber-optic-like optical properties, when found in transparent specimens. This particular matrix specimen is terminated, ...
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