Thursday, February 23, 2017


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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