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this slender prismatic doubly terminated little crystal is Childrenite on Microcline from Lavra do Poco Dantas, Minas Gerais, Brazil. It is 1" x 1/8" (25.4mm x 3.2mm). I have read that Childrenite makes a good "new species" mineral as it is only known in crystals (Author: Jim Prentiss)
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