Amethyst and Astrophyllite Physical Properties

Amethyst

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

insoluble in common solvents

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.653.2-3.4

1 7.18

1.5 Fracture

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

Uneven, Brittle, Metallic

1.6 Cleavage

Indiscernible

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

SiO₂

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Amethyst and Astrophyllite Chemical Formula

While comparing Amethyst and Astrophyllite 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 Amethyst and Astrophyllite chemical formula.

Chemical formula of Amethyst- SiO₂
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Amethyst and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Amethyst and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Amethyst and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Amethyst is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.