Rhodochrosite and Petalite Physical Properties

Rhodochrosite

Petalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.0-3.3

2.40

1.5 Fracture

Uneven, Conchoidal, Conchoidal to uneven, Brittle

Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal

1.6 Cleavage

On {10 1 1} perfect; parting on {10 1 2}

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

3.5-4

6-6.5

1.8 Chemical Composition

MnCO₃

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Rhodochrosite and Petalite Chemical Formula

While comparing Rhodochrosite and Petalite 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 Rhodochrosite and Petalite chemical formula.

Chemical formula of Rhodochrosite- MnCO₃
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Rhodochrosite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rhodochrosite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rhodochrosite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Rhodochrosite is 2.40 whereas that of Petalite is 2.40.