Almandine and Spodumene Physical Properties

Almandine

Spodumene

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.15-3.21

1.5 Fracture

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

Uneven, Subconchoidal, Gemstones (2009)

1.6 Cleavage

none

Perfect prismatic, two directions {110} ∧ {1 1 0} at 87°

1.7 Mohs Hardness

7-7.5

6-7

1.8 Chemical Composition

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

LiAlSi₂O₆

Almandine and Spodumene Chemical Formula

While comparing Almandine and Spodumene 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 Spodumene chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Spodumene- LiAlSi₂O₆

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Almandine and Spodumene Specific Gravity

Another important criteria for qualitative analysis of gemstones is Almandine and Spodumene Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Almandine and Spodumene Optical Properties during the identification of gemstone. Specific gravity of Almandine is 3.15-3.21 whereas that of Spodumene is 3.15-3.21.