Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.452.52-2.60
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Perfect on {001}, good on {110}
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
4-4.55.5-6
2
10
👆🏻
Chemical Composition
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references