Gedrite and Sillimanite Physical Properties

Gedrite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.15-3.2593.20-3.26

1 7.18

1.5 Fracture

Not Available

Splintery

1.6 Cleavage

Gedrite Magnesiogedrite , Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). , Location: Bamble, Telemark, Norway. , Scale: See Image.

{010} perfect

1.7 Mohs Hardness

5.5-66-7.5

2 10

1.8 Chemical Composition

(Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Gedrite and Sillimanite Chemical Formula

While comparing Gedrite and Sillimanite 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 Gedrite and Sillimanite chemical formula.

Chemical formula of Gedrite- (Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Brown Gemstones

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Gedrite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gedrite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gedrite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Gedrite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.