Hollandite and Ettringite Physical Properties

Hollandite

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

5.051.77

1 7.18

1.5 Fracture

Brittle, Metallic

Not Available

1.6 Cleavage

Distinct / Good, Prismatic

Perfect on {10 1 0}

1.7 Mohs Hardness

4-62-2.5

2 10

1.8 Chemical Composition

Ba(Mn++++,Mn++)8O16

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

Hollandite and Ettringite Chemical Formula

While comparing Hollandite 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 Hollandite and Ettringite chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Hollandite and Ettringite Specific Gravity

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