Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.9-3.53.04-3.17
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{110} Perfect, {???} Distinct, {???} Distinct
{001} Indistinct, {???} Indistinct
Mohs Hardness
5.5-65.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references