Phlogopite and Lazurite Physical Properties

Phlogopite

Lazurite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.78-2.852.75

1 7.18

1.5 Fracture

None, Uneven

Uneven, UnevenArthur Thomas, Gemstones (2009), Conchoidal, Brittle

1.6 Cleavage

Perfect basal (001)

Imperfect on {110}

1.7 Mohs Hardness

2-2.55.5

2 10

1.8 Chemical Composition

Not Available

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Phlogopite and Lazurite Chemical Formula

While comparing Phlogopite and Lazurite 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 Phlogopite and Lazurite chemical formula.

Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

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Phlogopite and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Phlogopite and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Phlogopite and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Phlogopite is 2.75 whereas that of Lazurite is 2.75.