Galena and Astrophyllite Physical Properties

Galena

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

6.233.2-3.4

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

Uneven, Brittle, Metallic

1.6 Cleavage

Cubic perfect on [001], parting on [111]

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2.5-2.753

2 10

1.8 Chemical Composition

PbS

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

Galena and Astrophyllite Chemical Formula

While comparing Galena 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 Galena and Astrophyllite chemical formula.

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

Compare Grey Gemstones

Galena Vs Clinochlore

Galena Vs Larvikite

Galena Vs Falcons Eye

Galena and Astrophyllite Specific Gravity

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