Gems, Conchoidal, Brittle
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references
Ca 3Ti4+2(Fe3+2Si)O 12Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 · nH 2OGemdat.org , Management Team (2012)