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Encyclopedia > Forsterite
Forsterite
General
Category Mineral
Chemical formula Magnesium silicate (Mg2SiO4)
Identification
Colour Green to yellow
Crystal system Orthorhombic
Cleavage {010}, {100} - imperfect
Fracture Conchoidal
Mohs Scale hardness 7
Luster Vitreous
Refractive index α = 1.635, β = 1.651, γ = 1.670
Specific gravity 3.222

Forsterite (Mg2SiO4) is the magnesium rich end-member of the olivine solid-solution series. Forsterite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.75 Å, b 10.20 Å and c Å 5.98. This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... In chemistry, a silicate is a compound consisting of silicon and oxygen (SixOy), one or more metals, and possibly hydrogen. ... Rose des Sables (Sand Rose), a formation of gypse crystal In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. ... Cleaveage, in mineralogy, is the tendency of crystalline materials to split along definite planes, creating smooth surfaces, of which there are several named types: Basal cleavage: cleavage parallel to the base of a crystal, or to the plane of the lateral axes. ... A fracture is the separation of a body into two, or more, pieces under the action of stress. ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... The refractive index of a material is the factor by which electromagnetic radiation is slowed down (relative to vacuum) when it travels inside the material. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Olivine The mineral olivine is a magnesium iron silicate with the formula (Mg,Fe)2SiO4 in which the ratio of magnesium and iron varies between the two endmembers of the series: forsterite (Mg-rich) and fayalite (Fe-rich). ... In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. ... The space group of a crystal is a mathematical description of the symmetry inherent in the structure. ...


References

  • Deer, W. A., Howie, R. A., and Zussman, J. (1992). An introduction to the rock-forming minerals (2nd ed.). Harlow: Longman ISBN 0-582-30094-0

  Results from FactBites:
 
Forsterite - Wikipedia, the free encyclopedia (173 words)
Forsterite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.75 Å, b 10.20 Å and c Å 5.98.
Forsterite is associated with igneous rocks and has also been found in some iron meteorites.
The gemstone variety of Forsterite is known as Peridot.
forsterite (290 words)
On Earth, forsterite is found in ultramafic igneous rocks or in marbles made from the metamorphism of dolomitic limestones.
The terms "forsterite chondrite" or "F chondrite" is also used to describe a type of inclusion that has been found in a handful of meteorites, including the Cumberland Falls aubrite, which fell in Whitley County, Kentucky in 1919, and the Antartic meteorite ALHA78113.
The way the forsterite and enstatite is associated in these specimens suggests that a small F chondrite parent body was violently disrupted by collision with an enstatite parent body, melted, and rapidly cooled.
  More results at FactBites »

 
 

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