Herderite and Andalusite Physical Properties

Herderite

Andalusite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

2.90-3.023.05-3.21

1 7.18

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Fracture

Subconchoidal, Conchoidal

Uneven, Subconchoidal, Splintery

Cleavage

Indistinct on {110}

Good on {110}, poor on {100}

Mohs Hardness

5-5.57.5

2 10

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Chemical Composition

CaBePO 4(F,OH)Ulrich Henn and Claudio C.

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Herderite and Andalusite Chemical Formula

While comparing Herderite and Andalusite 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 Herderite and Andalusite chemical formula.

Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare Colorless Gems

Herderite Vs Orthoclase

Herderite Vs Pectolite

Herderite Vs Phenakite

Herderite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Herderite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Herderite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Herderite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.