Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
-99993.1-3.2
1
7.18
👆🏻
Fracture
-
-
Cleavage
{???} Good, {???} Good, {???} Distinct
Vitreous, pearly on cleavage
Mohs Hardness
-99993-4
2
10
👆🏻
Chemical Composition
(Na,Ca)2BeSi2(O,OH)7
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references