Alunite and Smoky Quartz Physical Properties

Alunite

Smoky Quartz

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.92.65

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

On {0001}, perfect

{0110} Indistinct

1.7 Mohs Hardness

3.5-47

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

SiO₂

Alunite and Smoky Quartz Chemical Formula

While comparing Alunite and Smoky Quartz 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 Alunite and Smoky Quartz chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Smoky Quartz- SiO₂

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Alunite and Smoky Quartz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Smoky Quartz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Smoky Quartz Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.65 whereas that of Smoky Quartz is 2.65.