Howlite and Gypsum Physical Properties

Howlite

Gypsum

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1 Physical Properties

1.1 Tenacity

Not Available

Flexible

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.45-2.582.20-2.40

1 7.18

1.5 Fracture

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

Conchoidal, Splintery, Fibrous, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

None

Perfect on {010}, distinct on {100}

1.7 Mohs Hardness

3-3.52

2 10

1.8 Chemical Composition

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

CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

Howlite and Gypsum Chemical Formula

While comparing Howlite and Gypsum 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 Gypsum chemical formula.

Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Gypsum- CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

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Howlite and Gypsum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Howlite and Gypsum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Howlite and Gypsum Optical Properties during the identification of gemstone. Specific gravity of Howlite is 2.20-2.40 whereas that of Gypsum is 2.20-2.40.