Hollandite and Achroite Physical Properties

Hollandite

Achroite

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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

5.052.90-3.40

1 7.18

1.5 Fracture

Brittle, Metallic

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Distinct / Good, Prismatic

Not Available

1.7 Mohs Hardness

4-67-7.5

2 10

1.8 Chemical Composition

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

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Hollandite and Achroite Chemical Formula

While comparing Hollandite and Achroite 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 Achroite chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Hollandite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hollandite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hollandite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Hollandite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.