Hercynite and Howlite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
4.39
2.45-2.58
Fracture
ConchoidalGemdat.org, Uneven
UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
None
Mohs Hardness
7.5-8
3-3.5
Chemical Composition
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Hercynite and Howlite Chemical Formula
While comparing Hercynite 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 Hercynite and Howlite chemical formula.
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
- Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Hercynite and Howlite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Hercynite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.