1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.25-3.282.90-2.98
1
7.18
1.5 Fracture
Uneven
Conchoidal, Brittle, Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.6 Cleavage
{100} Distinct, {001} Poor, {110} Poor
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
1.7 Mohs Hardness
1.8 Chemical Composition
Ca2Fe++Al2BO3Si4O12(OH)
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references