Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.69-2.723.07-3.13
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, Uneven
Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
6-6.53-3.5
2
10
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Chemical Composition
(Na,Ca)1-2Si3-2O8
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references