Uneven, Uneven, Management Team (2012), Conchoidal, Brittle
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
Fe 3O 4Ulrich Henn and Claudio C.
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references