Astrophyllite and Onyx Physical Properties

Astrophyllite

Onyx

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.55-2.70

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Not Available

1.6 Cleavage

Perfect on [001] imperfect on [100]

Indiscernible

1.7 Mohs Hardness

36.5-7

2 10

1.8 Chemical Composition

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

SiO₂

Astrophyllite and Onyx Chemical Formula

While comparing Astrophyllite and Onyx 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 Astrophyllite and Onyx chemical formula.

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

Compare Green Gemstones

Astrophyllite Vs Blue John

Astrophyllite Vs Black Opal

Astrophyllite Vs Bloodstone Heliotrope

Astrophyllite and Onyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Onyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Onyx Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.55-2.70 whereas that of Onyx is 2.55-2.70.