Astrophyllite and Corundum Physical Properties

Astrophyllite

Corundum

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.43.90-4.05

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

Perfect on [001] imperfect on [100]

None – parting in 3 directions

1.7 Mohs Hardness

2 10

1.8 Chemical Composition

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

Al 2O 3Arthur Thomas , Gemstones (2009)

Astrophyllite and Corundum Chemical Formula

While comparing Astrophyllite and Corundum 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 Corundum 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 Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

Compare Green Gemstones

Astrophyllite Vs Bloodstone Heliotrope

Astrophyllite Vs Black Opal

Astrophyllite Vs Blue John

Astrophyllite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.