Goethite and Faustite Physical Properties

Goethite

Faustite

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

HCl soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.292.9

1 7.18

1.5 Fracture

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal

1.6 Cleavage

Perfect {010}

{???} Indistinct

1.7 Mohs Hardness

5-5.54.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

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

Goethite and Faustite Chemical Formula

While comparing Goethite and Faustite 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 Goethite and Faustite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Compare Brown Gemstones

Goethite Vs Jadeite

Goethite Vs Jacobsite

Goethite Vs Kyanite Cyprine

Goethite and Faustite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Goethite and Faustite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Goethite and Faustite Optical Properties during the identification of gemstone. Specific gravity of Goethite is 2.9 whereas that of Faustite is 2.9.