Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Uneven, ConchoidalWalter Schumann, Conchoidal
None, may show partings on {0001} and {10 1 1}
Fe 2O 3Arthur Thomas , Gemstones (2009)
Has perfect cleavage on {001} and good cleavage on {010}. Cleavages intersect at 90°.
KAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references