Achroite and Crocoite Physical Properties

Achroite

Crocoite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

2.90-3.405.90-6.10

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Conchoidal

Cleavage

Indiscernible

{110} Distinct, {001} Indistinct, {100} Indistinct

Mohs Hardness

7-7.52.5-3

2 10

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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.

PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Achroite and Crocoite Chemical Formula

While comparing Achroite and Crocoite 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 Crocoite 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 Crocoite- PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Achroite and Crocoite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Crocoite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Crocoite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 5.90-6.10 whereas that of Crocoite is 5.90-6.10.