Hollandite and Howlite Physical Properties

Hollandite

Howlite

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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

5.052.45-2.58

1 7.18

1.5 Fracture

Brittle, Metallic

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

Distinct / Good, Prismatic

None

1.7 Mohs Hardness

4-63-3.5

2 10

1.8 Chemical Composition

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

Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Hollandite and Howlite Chemical Formula

While comparing Hollandite and Howlite 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 Howlite chemical formula.

Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Hollandite and Howlite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hollandite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hollandite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Hollandite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.