Tanzanite and Andradite Physical Properties

Tanzanite

Andradite

Tanzanite

Andradite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.3 Solubility

Not Available

1.5 Durability

Hard

Not Available

1.7 Specific Gravity

3.353.70-4.10

1 7.18

1.6 Fracture

Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)

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

1.8 Cleavage

Perfect {010}, imperfect {100}

none

1.9 Mohs Hardness

6.5-76.5-7

2 10

1.13 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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