Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.173.76-3.77
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
{001} Indistinct, {???} Indistinct
{110} Perfect, {110} Perfect
Mohs Hardness
5.55-6
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
(Fe,Mn) 7Si 7O 21Ulrich Henn and Claudio C.