Phlogopite and Ettringite Physical Properties

Phlogopite

Ettringite

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.78-2.851.77

1 7.18

1.5 Fracture

None, Uneven

Not Available

1.6 Cleavage

Perfect basal (001)

Perfect on {10 1 0}

1.7 Mohs Hardness

2-2.52-2.5

2 10

1.8 Chemical Composition

Not Available

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

Phlogopite and Ettringite Chemical Formula

While comparing Phlogopite 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 Phlogopite and Ettringite chemical formula.

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

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Phlogopite and Ettringite Specific Gravity

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