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What is difference between forsterite and fayalite?

What is difference between forsterite and fayalite?

Fayalite is the iron rich member with a pure formula of Fe2SiO4. Forsterite is the magnesium rich member with a pure formula of Mg2SiO4. Otherwise they are difficult to distinguish and virtually all specimens of the two minerals contain both iron and magnesium.

Are forsterite and fayalite polymorphs?

It is isomorphous with the iron-rich end-member, fayalite. Forsterite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.75 Å (0.475 nm), b 10.20 Å (1.020 nm) and c 5.98 Å (0.598 nm)….

Forsterite
Fracture Conchoidal
Mohs scale hardness 7
Luster Vitreous
Streak White

What is forsterite used for?

Uses: As gemstones, industrial uses as refractory sands and abrasives, an ore of magnesium and as mineral specimens. Forsterite is named for the German naturalist, Johann Forster.

Is fayalite found on Earth?

forsterite-fayalite series, the most important minerals in the olivine family and possibly the most important constituents of the Earth’s mantle. Small amounts of fayalite are present in many volcanic rocks in which sodium is more common than potassium. …

Is fayalite an olivine?

, commonly abbreviated to Fa) is the iron-rich end-member of the olivine solid-solution series. Fayalite forms solid solution series with the magnesium olivine endmember forsterite (Mg2SiO4) and also with the manganese rich olivine endmember tephroite (Mn2SiO4). …

How do you identify forsterite?

Fayalite and Forsterite are simply known as Olivine. Fayalite is the iron-rich person in the series and Forsterite may be the magnesium user that is rich….Forsterite.

Color: Colorless, Green, pale Yellow, White
Refractive Index: 1.635 – 1.670 Biaxial ( + )
Birefringence: 0.0330 – 0.0420
Dispersion: r > v or r < v

What is the formula of Fayalite?

Fayalite (Fe2(SiO4))

PubChem CID 166944
Molecular Formula Fe2H4O4Si+4
Synonyms Fayalite (Fe2(SiO4)) iron(2+);silicic acid EINECS 237-687-3
Molecular Weight 207.80
Component Compounds CID 14942 (Orthosilicic acid) CID 23925 (FE (III) Ion)

What is the relief of forsterite?

Petrographic Data File

Forsterite
Property Value
Distinguishing Features Colorless to olive green in thin section. Second-order interference colors. High relief. Lack of cleavage. H= 6.5-7. G = 3.2. Streak is colorless or white. May be confused with epidote, which has cleavage and a is pistachio-green in hand sample.

What is the meaning of forsterite?

Definition of forsterite : a mineral consisting of magnesian olivine specifically : magnesium silicate Mg2SiO4 constituting the essential component of some refractories.

How fayalite is formed?

Fayalite from Paralavas Associated with Natural Coal Fires Of greater diversity are the minerals that form by rapid crystallization or quenching of melts at shallow depths or at the surface (komatiites, picrite basalts, picrite sills, and other mafic and ultramafic lavas) (Deer et al., 1982).

What type of mineral is fayalite?

, commonly abbreviated to Fa) is the iron-rich end-member of the olivine solid-solution series. In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.82 Å, b 10.48 Å and c 6.09 Å.

What is fayalite formula?

Molecular Formula. Fe2H4O4Si+4. Synonyms. Fayalite (Fe2(SiO4)) iron(2+);silicic acid.