Almandine and Chalcedony Physical Properties

Almandine

Chalcedony

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

2.55-2.70

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

none

Absent

1.7 Mohs Hardness

7-7.5

6.5-7

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

SiO₂

Almandine and Chalcedony Chemical Formula

While comparing Almandine and Chalcedony 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 Almandine and Chalcedony chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Chalcedony- SiO₂

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Almandine and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Almandine is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.