Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
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Mg 2Si 2O 6Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references