Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.50-2.802.52-2.60
1
7.18
👆🏻
Fracture
-
Uneven, Conchoidal
Cleavage
Perfect
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
5-6.55.5-6
2
10
👆🏻
Chemical Composition
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references