Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Uneven
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
ThCa 2Si 8O 20Walter Schumann , Gemstones of the world (2001) More from other references
SiO 2 · nH 2OGemdat.org , Management Team (2012)