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Mottramite
Mottramite

Austinite
Austinite



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Mottramite
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Austinite

Mottramite and Austinite Physical Properties

Physical Properties

Tenacity

Brittle
Brittle

Solubility

Soluble
Easily soluble in cold dilute HCl

Durability

-
-

Specific Gravity

5.94.12
1 7.18
👆🏻

Fracture

Sub-Conchoidal
Uneven

Cleavage

None observed
Good in two directions parallel to the prism faces {110}

Mohs Hardness

34-4.5
2 10
👆🏻

Chemical Composition

PbCu(VO4)(OH)
CaZn(AsO4)(OH)

Mottramite and Austinite Chemical Formula

While comparing Mottramite and Austinite 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 Mottramite and Austinite chemical formula.

  • Chemical formula of Mottramite- PbCu(VO4)(OH)
  • Chemical formula of Austinite- CaZn(AsO4)(OH)

Mottramite and Austinite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Mottramite and Austinite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Mottramite and Austinite Optical Properties during the identification of gemstone. Specific gravity of Mottramite is 4.12 whereas that of Austinite is 4.12.