1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.52-2.602.64-2.70
1
7.18
1.5 Fracture
Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Metallic
(e.g. graphite).
1.6 Cleavage
{0001} Imperfect, {1120} Imperfect
{010} Perfect
1.7 Mohs Hardness
1.8 Chemical Composition
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.