Alunite and Erythrite Physical Properties

Alunite

Erythrite

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1 Physical Properties

1.1 Tenacity

Brittle

Sectile

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.06

1 7.18

1.5 Fracture

Conchoidal, Uneven

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

On {0001}, perfect

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

3.5-4Not Available

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Co3(AsO4)2•8(H2O)

Alunite and Erythrite Chemical Formula

While comparing Alunite and Erythrite 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 Alunite and Erythrite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

Compare Red Gemstones

Alunite Vs Erythrite

Alunite Vs Kainite

Alunite Vs Piemontite

Alunite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.06 whereas that of Erythrite is 3.06.