Ettringite and Petalite Physical Properties

Ettringite

Petalite

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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

1.772.40

1 7.18

1.5 Fracture

Not Available

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

2-2.56-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Ettringite and Petalite Chemical Formula

While comparing Ettringite and Petalite 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 Petalite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Ettringite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.40 whereas that of Petalite is 2.40.