Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.55-2.632.40-2.42
1
7.18
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Fracture
Uneven
-
Cleavage
{001} Perfect, {010} Good
{010} Perfect, {001} Distinct
Mohs Hardness
6-6.54.5
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
Ca 2B 6O 11 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references