Amethyst and Ettringite Physical Properties

Amethyst

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble in common solvents

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.651.77

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Indiscernible

Perfect on {10 1 0}

1.7 Mohs Hardness

72-2.5

2 10

1.8 Chemical Composition

SiO₂

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

Amethyst and Ettringite Chemical Formula

While comparing Amethyst and Ettringite 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 Amethyst and Ettringite chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Amethyst and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Amethyst and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 1.77 whereas that of Ettringite is 1.77.