Schorl and Iolite Physical Properties

Schorl

Iolite

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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

3.18-3.222.6-2.7

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal

Not Available

1.6 Cleavage

{1011} Indistinct

3,1

1.7 Mohs Hardness

Not Available7-7.5

2 10

1.8 Chemical Composition

Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Mg₂Al₄Si₅O₁₈

Schorl and Iolite Chemical Formula

While comparing Schorl and Iolite 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 Schorl and Iolite chemical formula.

Chemical formula of Schorl- Na(Fe2+3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈

Compare Black Gemstones

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Schorl and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Schorl and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Schorl and Iolite Optical Properties during the identification of gemstone. Specific gravity of Schorl is 2.6-2.7 whereas that of Iolite is 2.6-2.7.