Howlite and Star Sapphire Physical Properties

Howlite

Star Sapphire

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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

2.45-2.583.90-4.05

1 7.18

2.5 Fracture

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

Not Available

2.6 Cleavage

None

Not Available

2.7 Mohs Hardness

3-3.5Not Available

2 10

2.11 Chemical Composition

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

Al 2O 3Ulrich Henn and Claudio C.

Howlite and Star Sapphire Chemical Formula

While comparing Howlite and Star Sapphire 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 Howlite and Star Sapphire chemical formula.

Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.

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Howlite and Star Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Howlite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Howlite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Howlite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.