Allanite and Howlite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.40-4.20
2.45-2.58
Fracture
Not Available
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Not Available
None
Mohs Hardness
Not Available
3-3.5
Chemical Composition
Not Available
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Allanite and Howlite Chemical Formula
While comparing Allanite 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 Allanite and Howlite chemical formula.
>- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Allanite and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Allanite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Allanite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Allanite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.