Faustite and Polyhalite Physical Properties

Faustite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.92.78

1 7.18

1.7 Fracture

Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal

Conchoidal, Brittle

1.8 Cleavage

{???} Indistinct

Perfect on {10 1 }; parting on {010}

1.9 Mohs Hardness

4.53.5

2 10

1.13 Chemical Composition

(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Not Available

Faustite and Polyhalite Chemical Formula

While comparing Faustite and Polyhalite 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 Faustite and Polyhalite chemical formula.

Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Faustite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Faustite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Faustite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Faustite is 2.78 whereas that of Polyhalite is 2.78.