Galena and Ettringite Physical Properties

Galena

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

6.231.77

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

Not Available

1.6 Cleavage

Cubic perfect on [001], parting on [111]

Perfect on {10 1 0}

1.7 Mohs Hardness

2.5-2.752-2.5

2 10

1.8 Chemical Composition

PbS

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

Galena and Ettringite Chemical Formula

While comparing Galena 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 Galena and Ettringite chemical formula.

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

Compare Grey Gemstones

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Galena Vs Falcons Eye

Galena and Ettringite Specific Gravity

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