Ettringite and Oligoclase Physical Properties

Ettringite

Oligoclase

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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

1.772.62-2.67

1 7.18

1.5 Fracture

Not Available

Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven

1.6 Cleavage

Perfect on {10 1 0}

From the Greek, oligos and kasein, little cleavage.

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)

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Ettringite and Oligoclase Chemical Formula

While comparing Ettringite and Oligoclase 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 Oligoclase chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Ettringite and Oligoclase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.