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Bertrandite: Be4Si2O7(OH)2
Comments: Colorless prismatic crystals of bertrandite on matrix with pale pink rhombohedral crystals of rhodochrosite. Location: Yiaoguanshen mine, Hunan Province, China. Scale: 3.5 x 4 cm. © Dan Weinrich
Comments: Fan-like clusters of bertrandite crystals with brown rhodochrosite and quartz. Location: Kara Oba, Kazakhstan. Scale: Crystal size 1.1 cm. © John Veevaert