Uneven, Uneven, Gemstones of the world (2001) More from other references
Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
H 4Mg 3Si 2O 9Walter Schumann , Gemstones of the world (2001) More from other references
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references