Gems, Uneven
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
Has perfect cleavage on {001} and good cleavage on {010}. Cleavages intersect at 90°.
Vitreous, pearly on cleavage
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references