Achroite and Herderite Physical Properties

Achroite

Herderite

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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

2.90-3.402.90-3.02

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Not Available

Indistinct on {110}

1.7 Mohs Hardness

7-7.55-5.5

2 10

1.8 Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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

Achroite and Herderite Chemical Formula

While comparing Achroite and Herderite 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 Achroite and Herderite chemical formula.

Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.

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Achroite and Herderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Herderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Herderite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.90-3.02 whereas that of Herderite is 2.90-3.02.