Description: Cassiterite and Beryl on Muscovite Mt. Xuebaoding, Pingwu County, Mianyang Prefecture, Sichuan Province, China 86.0 x 78.0 x 37.0 mm overall A perfect, lustrous black twin of Cassiterite, measuring 39 x 33 x 17 mm, is perched on a pair of pale blue Beryl crystals to 27 x 9 mm, all nestled in a matrix of Muscovite crystals to 18 mm across. No damage.

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