UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
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NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006)