ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).
Be 3Al 2Si 6O 18Ulrich Henn and Claudio C.
FeO(OH)Arthur Thomas , Gemstones (2009)