1 Physical Properties
1.2 Tenacity
Not Available
Not Available
1.4 Solubility
Not Available
Not Available
1.7 Durability
Not Available
Not Available
1.9 Specific Gravity
Not Available2.54-2.78
1
7.18
1.11 Fracture
Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)
1.12 Cleavage
{???} Good, {???} Good, {???} Distinct
Good in three directions
1.13 Mohs Hardness
1.14 Chemical Composition
Not Available
K(Ca,Na) 2Si 4O 10(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references