Ettringite and Spodumene Physical Properties

Ettringite

Spodumene

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.15-3.21

1 7.18

1.5 Fracture

Not Available

Uneven, Subconchoidal, Gemstones (2009)

1.6 Cleavage

Perfect on {10 1 0}

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

1.7 Mohs Hardness

2-2.56-7

2 10

1.8 Chemical Composition

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

LiAlSi₂O₆

Ettringite and Spodumene Chemical Formula

While comparing Ettringite 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 Ettringite and Spodumene chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Spodumene- LiAlSi₂O₆

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Ettringite and Spodumene Specific Gravity

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