Astrophyllite and Hollandite Physical Properties

Astrophyllite

Hollandite

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.45.05

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Brittle, Metallic

1.6 Cleavage

Perfect on [001] imperfect on [100]

Distinct / Good, Prismatic

1.7 Mohs Hardness

34-6

2 10

1.8 Chemical Composition

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

Ba(Mn++++,Mn++)8O16

Astrophyllite and Hollandite Chemical Formula

While comparing Astrophyllite and Hollandite 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 Hollandite 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 Hollandite- Ba(Mn++++,Mn++)8O16

Compare Green Gemstones

Astrophyllite Vs Bloodstone Heliotrope

Astrophyllite Vs Blue John

Astrophyllite Vs Black Opal

Astrophyllite and Hollandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 5.05 whereas that of Hollandite is 5.05.