Ulexite, Calcite

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The borate deposits of California have produced some really beautiful/unusual mineral specimens. Few are as unusual as ulexite, also called "TV rock" for its fiber-optic-like optical properties. This particular matrix specimen is features a radiating spray of discrete ulexite needles, something you almost never see in the mineral. The needles have superb luster and a pearlescent, white to tan color. The ulexite needles are in association with some tan, translucent calcite crystals in rounded masses. Ex. Jim Minette Collection.