1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.04-3.172.59-2.60
1
7.18
1.5 Fracture
Uneven, Uneven, Gemstones of the world (2001) More from other references
Brittle, Metallic, Brittle, Metallic
1.6 Cleavage
{001} Indistinct, {???} Indistinct
{001} Perfect, {110} Distinct, {101} Distinct
1.7 Mohs Hardness
1.8 Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)