Apophyllite KF and Howlite Physical Properties
Tenacity
Brittle
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.33-2.37
2.45-2.58
Fracture
Uneven, Brittle, Uneven, Brittle, Uneven
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Perfect on {001}, imperfect on {110}
None
Mohs Hardness
4.5-5
3-3.5
Chemical Composition
(K,Na)Ca4Si8O20(F,OH)•8(H2O)
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Apophyllite KF and Howlite Chemical Formula
While comparing Apophyllite KF and Howlite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Apophyllite KF and Howlite chemical formula.
- Chemical formula of Apophyllite KF- (K,Na)Ca4Si8O20(F,OH)•8(H2O)
- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Apophyllite KF and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Apophyllite KF and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apophyllite KF and Howlite Optical Properties during the identification of gemstone. Specific gravity of Apophyllite KF is 2.45-2.58 whereas that of Howlite is 2.45-2.58.