Ettringite and Rock Crystal Physical Properties

Ettringite

Rock Crystal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.65

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Perfect on {10 1 0}

Not Available

1.7 Mohs Hardness

2-2.57

2 10

1.8 Chemical Composition

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

SiO 2Walter Schumann , Gemstones of the world (2001)

Ettringite and Rock Crystal Chemical Formula

While comparing Ettringite and Rock Crystal 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 Rock Crystal chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

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Ettringite and Rock Crystal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.65 whereas that of Rock Crystal is 2.65.