Forsterite

fosteriteforsteriticforsteritic olivine
Forsterite (Mg 2 SiO 4 ; commonly abbreviated as Fo; also known as white olivine) is the magnesium-rich end-member of the olivine solid solution series.wikipedia
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Olivine

olivine basaltchrysoliteolivine group
Forsterite (Mg 2 SiO 4 ; commonly abbreviated as Fo; also known as white olivine) is the magnesium-rich end-member of the olivine solid solution series.
The ratio of magnesium to iron varies between the two endmembers of the solid solution series: forsterite (Mg-endmember: Mg 2 SiO 4 ) and fayalite (Fe-endmember: Fe 2 SiO 4 ).

Fayalite

iron silicateFafayalitic
It is isomorphous with the iron-rich end-member, fayalite. Forsterite, fayalite (Fe 2 SiO 4 ) and tephroite (Mn 2 SiO 4 ) are the end-members of the olivine solid solution series; other elements such as Ni and Ca substitute for Fe and Mg in olivine, but only in minor proportions in natural occurrences.
Fayalite forms solid solution series with the magnesium olivine endmember forsterite (Mg 2 SiO 4 ) and also with the manganese rich olivine endmember tephroite (Mn 2 SiO 4 ).

Ringwoodite

γ-olivineringwoodit
Two polymorphs of forsterite are known: wadsleyite (also orthorhombic) and ringwoodite (isometric).
It is polymorphous with the olivine phase forsterite (a magnesium iron silicate).

Wadsleyite

Two polymorphs of forsterite are known: wadsleyite (also orthorhombic) and ringwoodite (isometric).
It is formed by a phase transformation from forsterite (α-Mg 2 SiO 4 ) under increasing pressure and eventually transforms into spinel-structured ringwoodite (γ-Mg 2 SiO 4 ) as pressure increases further.

Peridot

chrysolitechrysolitesPeridor
Peridot is the gemstone variety of forsterite olivine.
As peridot is a magnesium-rich variety of olivine (forsterite), the formula approaches Mg 2 SiO 4.

Tephroite

Forsterite, fayalite (Fe 2 SiO 4 ) and tephroite (Mn 2 SiO 4 ) are the end-members of the olivine solid solution series; other elements such as Ni and Ca substitute for Fe and Mg in olivine, but only in minor proportions in natural occurrences.
A solid solution series exists between tephroite and its analogues, the group endmembers fayalite and forsterite.

Cumulate rock

cumulatecumulatesCumulate rocks
Due to its high melting point, olivine crystals are the first minerals to precipitate from a magmatic melt in a cumulate process, often with orthopyroxenes.

Serpentinite

serpentineserpentinizationserpentinized
Nearly pure forsterite occurs in some metamorphosed serpentinites.
Olivine is a solid solution between the magnesium-endmember forsterite and the iron-endmember fayalite.

Monticellite

kirschsteinite
Other minerals such as monticellite (CaMgSiO 4 ), an uncommon calcium-rich mineral, share the olivine structure, but solid solution between olivine and these other minerals is limited.

Silicate minerals

silicate mineralphyllosilicatephyllosilicates

Armand Lévy (mineralogist)

Armand Lévy
It was named by Armand Lévy in 1824 after the English naturalist and mineral collector Adolarius Jacob Forster.
Armand Lévy described many mineral species, such as babingtonite, beudantite, brochantite, brookite, forsterite, phillipsite, roselite and willemite.

Jacob Forster

Adolarius Jacob Forster
It was named by Armand Lévy in 1824 after the English naturalist and mineral collector Adolarius Jacob Forster.
The mineral Forsterite is named for him.

Endmember

end memberendmembersend-member
Forsterite (Mg 2 SiO 4 ; commonly abbreviated as Fo; also known as white olivine) is the magnesium-rich end-member of the olivine solid solution series.

Solid solution

exsolutionsolid-solutionexsolved
Forsterite (Mg 2 SiO 4 ; commonly abbreviated as Fo; also known as white olivine) is the magnesium-rich end-member of the olivine solid solution series.

Isomorphism (crystallography)

isomorphousisomorphicisomorphism
It is isomorphous with the iron-rich end-member, fayalite.

Orthorhombic crystal system

orthorhombicorthorombicorthorhombic system
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).

Space group

crystallographic groupspace groupsList of the 230 crystallographic 3D space groups
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).

Angstrom

Åångströmangstroms
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).

Nanometre

nmnanometernanometers
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).

Igneous rock

igneousigneous rocksdecompression melting
Forsterite is associated with igneous and metamorphic rocks and has also been found in meteorites.

Metamorphic rock

metamorphicmetamorphosedmetamorphic rocks
Nearly pure forsterite occurs in some metamorphosed serpentinites. Forsterite is associated with igneous and metamorphic rocks and has also been found in meteorites.

Meteorite

meteoritesmeteoriticmeteoric
Forsterite is associated with igneous and metamorphic rocks and has also been found in meteorites.

Comet

cometslong-period cometJupiter-family comet
In 2005 it was also found in cometary dust returned by the Stardust probe.

Stardust (spacecraft)

StardustStardust spacecraftStardust mission
In 2005 it was also found in cometary dust returned by the Stardust probe.

Gemstone

gemgemsgemstones
Peridot is the gemstone variety of forsterite olivine.