Hollandite and Spinel Physical Properties

Hollandite

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

5.053.64-3.66

1 7.18

1.5 Fracture

Brittle, Metallic

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Distinct / Good, Prismatic

None, but may exhibit slight parting

1.7 Mohs Hardness

4-68

2 10

1.8 Chemical Composition

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

MgAl₂O₄

Hollandite and Spinel Chemical Formula

While comparing Hollandite and Spinel 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 Spinel chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Chemical formula of Spinel- MgAl₂O₄

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Hollandite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hollandite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hollandite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Hollandite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.