Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Gems, Sixth Edition (2006), Gems, Sixth Edition (2006)
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references
SiO 2Michael OâDonoghue , Gems, Sixth Edition (2006)