Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.40-2.422.50-2.80
1
7.18
👆🏻
Fracture
-
-
Cleavage
{010} Perfect, {001} Distinct
Perfect
Mohs Hardness
4.55-6.5
2
10
👆🏻
Chemical Composition
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Na 4(Al,Si) 12O 24Cl to Ca 4(Si,Al) 12O 24(CO 3,SO 4)Arthur Thomas , Gemstones (2009)