Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.402.74-2.76
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
perfect on {010}; good on {100}
{010} Perfect, {001} Distinct
Mohs Hardness
5-5.53.5-4
2
10
👆🏻
Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)