Labradorite and Howlite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.69-2.72
2.45-2.58
Fracture
Uneven, Conchoidal, Gems, Sixth Edition (2006)
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
Perfect on {001}, less perfect on {010}, intersecting at near 90°; distinct on {110}
None
Mohs Hardness
6-6.5
3-3.5
Chemical Composition
(Na,Ca)1-2Si3-2O8
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Labradorite and Howlite Chemical Formula
While comparing Labradorite 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 Labradorite and Howlite chemical formula.
- Chemical formula of Labradorite- (Na,Ca)1-2Si3-2O8
- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Labradorite and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Labradorite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Labradorite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Labradorite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.