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
Not Available2.54-2.78
1
7.18
1.5 Fracture
Sub-Conchoidal, Splintery
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
{201} Imperfect, {100} Poor, {001} Poor
Good in three directions
1.7 Mohs Hardness
1.8 Chemical Composition
Not Available
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references