Ulexite is one of the rare borate minerals. Boron is a trace element of Earth's crust and borates form under only one condition - in drainage basins from fragments of rocks erupted by volcanoes. Ulexite looks like it's made up of closely-packed fibrous crystals. Small polished pieces will transmit an image from one side to the other like fiber-optics. That optical phenomena gave Ulexite a nickname of "TV rock". Hardness is 2.5
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