Conchoidal, Brittle, Metallic, Conchoidal, Handbook of mineralogy (2001)
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
(Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)
SiCArthur Thomas , Gemstones (2009)