Tourmaline and Rock Crystal Physical Properties

Tourmaline

Rock Crystal

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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

2.85-3.352.65

1 7.18

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Indistinct

Not Available

1.7 Mohs Hardness

7-7.57

2 10

1.8 Chemical Composition

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

SiO 2Walter Schumann , Gemstones of the world (2001)

Tourmaline and Rock Crystal Chemical Formula

While comparing Tourmaline and Rock Crystal 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 Tourmaline and Rock Crystal chemical formula.

Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

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Tourmaline and Rock Crystal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Tourmaline and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Tourmaline and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Tourmaline is 2.65 whereas that of Rock Crystal is 2.65.