Rock Crystal and Andalusite Physical Properties

Rock Crystal

Andalusite

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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

2.653.05-3.21

1 7.18

1.5 Fracture

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

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Not Available

Good on {110}, poor on {100}

1.7 Mohs Hardness

77.5

2 10

1.8 Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Rock Crystal and Andalusite Chemical Formula

While comparing Rock Crystal and Andalusite 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 Andalusite chemical formula.

Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare Blue Gemstones

Rock Crystal Vs Scorzalite

Rock Crystal Vs Serendibite

Rock Crystal Vs Sardonyx

Rock Crystal and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rock Crystal and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rock Crystal and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Rock Crystal is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.