1 Physical Properties
1.1 Tenacity
Not Available
Not Available
2.3 Solubility
Not Available
Not Available
2.5 Durability
Not Available
Not Available
2.7 Specific Gravity
2.11 Fracture
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
2.12 Cleavage
Vitreous, pearly on cleavage
Not Available
2.13 Mohs Hardness
3.4 Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.