Rock Crystal and Tourmaline Physical Properties

Rock Crystal

Tourmaline

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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

2.652.85-3.35

1 7.18

1.5 Fracture

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

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Not Available

Indistinct

1.7 Mohs Hardness

77-7.5

2 10

1.8 Chemical Composition

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

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

Rock Crystal and Tourmaline Chemical Formula

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

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

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Rock Crystal Vs Sardonyx

Rock Crystal and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rock Crystal and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rock Crystal and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Rock Crystal is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.