Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.373.07-3.13
1
7.18
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Fracture
Uneven
Conchoidal, Uneven
Cleavage
Perfect on {001}, imperfect on {110}
{100} Perfect, {010} Distinct, {102} Distinct
Mohs Hardness
4.5-53-3.5
2
10
👆🏻
Chemical Composition
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
Zn 2(Fe2+ ,Mn2+ )(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references