1 Physical Properties
1.1 Tenacity
1.2 Solubility
Readily soluble in water
insoluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven, Conchoidal, Brittle
Uneven, Subconchoidal, UnevenArthur Thomas, Fibrous
1.6 Cleavage
Good on {0001}
[110] perfect, [101] good, [010] distinct
1.7 Mohs Hardness
1.8 Chemical Composition
KNa22(SO4)9(CO3)2Cl
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references