Umbalite and Common Opal Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.62-4.33
1.98-2.50
Fracture
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
Conchoidal, Conchoidal, Gemstones of the world (2001)
Cleavage
Not Available
Not Available
Mohs Hardness
7-7.5
5.5-6.5
Chemical Composition
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Umbalite and Common Opal Chemical Formula
While comparing Umbalite and Common Opal 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 Umbalite and Common Opal chemical formula.
- Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
- Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Umbalite and Common Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Umbalite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Umbalite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Umbalite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.