Tenacity
Solubility
Durability
Specific Gravity
Fracture
Cleavage
Mohs Hardness
Chemical Composition
Uneven, Subconchoidal, Fibrous
[110] perfect, [101] good, [010] distinct
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Perfect on {110} at 56° and 124°; partings on {010} and {100}
Ca 2Mg 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.