Biotite and Ludlamite Physical Properties

Biotite

Ludlamite

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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

2.7-3.33.1-3.2

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on the {001}

Vitreous, pearly on cleavage

1.7 Mohs Hardness

2.5-3.03-4

2 10

1.8 Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Ludlamite Chemical Formula

While comparing Biotite and Ludlamite 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 Biotite and Ludlamite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Ludlamite- (Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Ludlamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Ludlamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Ludlamite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.1-3.2 whereas that of Ludlamite is 3.1-3.2.