1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.98-3.032.70-2.75
1
7.18
1.5 Fracture
Uneven
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
[110] perfect; [010] distinct
From the Greek for luster, for its pearly luster on the cleavage.
1.7 Mohs Hardness
1.8 Chemical Composition
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)