UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
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Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)