Willemite and Howlite Physical Properties

Willemite and Howlite Chemical Formula

While comparing Willemite 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 Willemite and Howlite chemical formula.

• Chemical formula of Willemite- Zn 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
• Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Willemite and Howlite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Willemite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Willemite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Willemite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.