Londonite and Obsidian Physical Properties

Londonite and Obsidian Chemical Formula

While comparing Londonite and Obsidian 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 Londonite and Obsidian chemical formula.

• Chemical formula of Londonite- (Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
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Londonite and Obsidian Specific Gravity

Another important criteria for qualitative analysis of gemstones is Londonite and Obsidian Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Londonite and Obsidian Optical Properties during the identification of gemstone. Specific gravity of Londonite is 2.35-2.60 whereas that of Obsidian is 2.35-2.60.