Achroite and Arfvedsonite Physical Properties

Achroite

Arfvedsonite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.403.3-3.5

1 7.18

1.5 Fracture

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

Uneven, Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

Not Available

Perfect on [110]

1.7 Mohs Hardness

7-7.55-6

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.

NaNa2(Fe++4Fe+++)Si8O22(OH)2

Achroite and Arfvedsonite Chemical Formula

While comparing Achroite and Arfvedsonite 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 Arfvedsonite 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 Arfvedsonite- NaNa2(Fe++4Fe+++)Si8O22(OH)2

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Achroite and Arfvedsonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Arfvedsonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Arfvedsonite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 3.3-3.5 whereas that of Arfvedsonite is 3.3-3.5.