Kyanite and Howlite Physical Properties

Kyanite

Howlite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.53-3.65

2.45-2.58

1.5 Fracture

Splintery, Brittle, Metallic

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

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

None

1.7 Mohs Hardness

4-7

3-3.5

1.8 Chemical Composition

Not Available

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

Kyanite and Howlite Chemical Formula

While comparing Kyanite 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 Kyanite and Howlite chemical formula.

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

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Kyanite and Howlite Specific Gravity

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