Common Opal and Legrandite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
1.98-2.50
3.98-4.04
Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle
Cleavage
Not Available
Imperfect, poor one {100}
Mohs Hardness
5.5-6.5
4.5-5
Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Common Opal and Legrandite Chemical Formula
While comparing Common Opal and Legrandite 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 Common Opal and Legrandite chemical formula.
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
- Chemical formula of Legrandite- Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Common Opal and Legrandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Common Opal and Legrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Common Opal and Legrandite Optical Properties during the identification of gemstone. Specific gravity of Common Opal is 3.98-4.04 whereas that of Legrandite is 3.98-4.04.