Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.172.50-2.80
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
{001} Indistinct, {???} Indistinct
Perfect
Mohs Hardness
5.55-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)