Hollandite and Andalusite Physical Properties

Hollandite

Andalusite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

5.05

3.05-3.21

1.5 Fracture

Brittle, Metallic

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Distinct / Good, Prismatic

Good on {110}, poor on {100}

1.7 Mohs Hardness

4-6

7.5

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Hollandite and Andalusite Chemical Formula

While comparing Hollandite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Hollandite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hollandite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hollandite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Hollandite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.