Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.55-3.703.1-3.2
1
7.18
👆🏻
Fracture
-
-
Cleavage
Perfect
Vitreous, pearly on cleavage
Mohs Hardness
4-73-4
2
10
👆🏻
Chemical Composition
Al 2SiO 5Arthur Thomas , Gemstones (2009) More from other references
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references