Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Be 3Al 2Si 6O 18Ulrich Henn and Claudio C.
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.