Holmquistite and Topaz Physical Properties

Holmquistite

Topaz

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.95-3.133.49-3.57

1 7.18

1.5 Fracture

Not Available

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

{210} Perfect

[001] Perfect

1.7 Mohs Hardness

5-68

2 10

1.8 Chemical Composition

Li 2[(Mg,Fe2+ ) 3Al 2]Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Al₂SiO₄(F,OH)₂

Holmquistite and Topaz Chemical Formula

While comparing Holmquistite and Topaz 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 Holmquistite and Topaz chemical formula.

Chemical formula of Holmquistite- Li 2[(Mg,Fe2+ ) 3Al 2]Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Holmquistite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Holmquistite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Holmquistite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Holmquistite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.