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How rare is serendibite?
Borosilicate mineral that is very rare indeed in crystalline form. At one time crystalline serendibite was one of the rarest gems in the world and only a handful of specimens were known to exist. Serendibite forms small blue-green, blue-grey to deep blue, sometimes yellow, transparent tabular crystals. The material is strongly pleochroic: yellowish green, bluish green and violet-blue. Cut stones are rare and usually of small size.