1 Physical Properties
1.1 Tenacity
1.3 Solubility
1.5 Durability
Not Available
Not Available
1.6 Specific Gravity
1.10 Fracture
Irregular/uneven
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)
1.11 Cleavage
Perfect cleavage parallel to base and prism faces: {001} Perfect, {210} Perfect, {010} Imperfect
Vitreous, pearly on cleavage
1.12 Mohs Hardness
1.14 Chemical Composition
Not Available
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references