Faustite and Umbalite Physical Properties

Faustite

Umbalite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.93.62-4.33

1 7.18

1.5 Fracture

Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal

Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)

1.6 Cleavage

{???} Indistinct

Not Available

1.7 Mohs Hardness

4.57-7.5

2 10

1.8 Chemical Composition

(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

Faustite and Umbalite Chemical Formula

While comparing Faustite and Umbalite 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 Faustite and Umbalite chemical formula.

Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

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Faustite and Umbalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Faustite and Umbalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Faustite and Umbalite Optical Properties during the identification of gemstone. Specific gravity of Faustite is 3.62-4.33 whereas that of Umbalite is 3.62-4.33.