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Encyclopedia > Peridot
Peridot

General
Category Mineral
Chemical formula (Mg, Fe)2SiO4
Identification
Color Yellow to yellow-green
Crystal system Orthorhombic
Cleavage Poor
Fracture Conchoidal
Mohs Scale hardness 6.5-7
Luster Vitreous (glassy)
Refractive index 1.64-1.70
Birefringence +0.036
Streak White
Specific gravity 3.2-4.3

Peridot (pronounced "pair-uh-dot" or "pair-uh-doe", IPA: /pɛɹɪdɑːt/ or Fr. /peʁido/) is the gem quality variety of forsteritic olivine. The chemical composition of peridot is (Mg, Fe)2SiO4, with Mg in greater quantities than Fe. The name of the gemstone is believed to come from either the Arabic word faridat meaning "gem" or the French word peritot meaning "unclear." Peridot is one of the few gemstones that comes in only one color. The depth of green depends on how much iron is contained in the crystal structure, and varies from yellow-green to olive to brownish green. Peridot is also often referred to as "poor man's emerald". Olivine is a very abundant mineral, but gem-quality peridot is rather rare. Peridot crystals have been collected from iron-nickel meteorites. Peridot is an IBM project developed by the ExtremeBlue internship program to check web sites for broken links and assist in updating them. ... Image File history File linksMetadata Download high-resolution version (1190x1312, 317 KB) [edit] ファイルの概要 Peridot. ... A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... A crystal system is a category of space groups, which characterize symmetry of structures in three dimensions with translational symmetry in three directions, having a discrete class of point groups. ... In crystallography, the orthorhombic crystal system is one of the 7 lattice point groups. ... Cleavage, 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. ... For other uses, see Fracture (disambiguation). ... Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer. ... Lustre (American English: luster) is a description of the way light interacts with the surface of a crystal, rock or mineral. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... A calcite crystal laid upon a paper with some letters showing the double refraction Birefringence, or double refraction, is the decomposition of a ray of light into two rays (the ordinary ray and the extraordinary ray) when it passes through certain types of material, such as calcite crystals, depending on... The streak (also called powder color) of a mineral is the color of the powder produced when it is dragged across a unweathered surface. ... Relative density (also known as specific gravity) is a measure of the density of a material. ... Forsterite (Mg2SiO4) is the magnesium rich end-member of the olivine solid-solution series. ... The mineral olivine (also called chrysolite and, when gem-quality, peridot) is a magnesium iron silicate with the formula (Mg,Fe)2SiO4. ... For other uses, see Iron (disambiguation). ... The mineral olivine (also called chrysolite and, when gem-quality, peridot) is a magnesium iron silicate with the formula (Mg,Fe)2SiO4. ... Willamette Meteorite A meteorite is a natural object originating in outer space that survives an impact with the Earths surface without being destroyed. ...


Occurrence

Olivine/peridot is a common mineral in mafic and ultramafic rocks, and is often found in lavas and in peridotite xenoliths of the mantle that lavas carry to the surface; however, gem-quality peridot only occurs in a fraction of these settings. Peridot/olivine is mined in North Carolina, Arizona, Hawaii, Nevada, and New Mexico, in the US; and in Australia, Brazil, China, Kenya, Mexico, Myanmar (Burma), Norway, Pakistan, South Africa, Sri Lanka, and Tanzania. Peridot/olivine of high quality is commercially mined in the eastern lava fields of Saudi Arabia. The largest cut peridot/olivine is a 310 carat (62 g) specimen in the Smithsonian Museum in Washington, D.C.. A special variety of a peridot/olivine from Pakistan is known as "Kashmir" peridot. Due to the large size of the rough stones found there, cutters have successfully created faceted stones of over 100 carats (20 g) from the rough gems of this area.[citation needed] In geology, mafic minerals and rocks are silicate minerals, magmas, and volcanic and intrusive igneous rocks that have relatively high concentrations of the heavier elements. ... Igneous rock which crystallizes from silicate minerals at the highest temperatures is referred to as ultramafic rock. ... Look up lava, Aa, pahoehoe in Wiktionary, the free dictionary. ... Peridotite xenolith from San Carlos, southwestern United States. ... A xenolith A xenolith (Greek: foreign rock) is a rock fragment which becomes enveloped in a larger rock during the latters development and hardening. ... Earth cutaway from core to exosphere. ... Official language(s) English Capital Raleigh Largest city Charlotte Largest metro area Charlotte metro area Area  Ranked 28th  - Total 53,865 sq mi (139,509 km²)  - Width 150 miles (240 km)  - Length 560[1] miles (901 km)  - % water 9. ... Official language(s) English Spoken language(s) English 74. ... Official language(s) English, Hawaiian Capital Honolulu Largest city Honolulu Area  Ranked 43rd  - Total 10,931 sq mi (29,311 km²)  - Width n/a miles (n/a km)  - Length 1,522 miles (2,450 km)  - % water 41. ... This article is about the U.S. State of Nevada. ... Capital Santa Fe Largest city Albuquerque Largest metro area Albuquerque metropolitan area Area  Ranked 5th  - Total 121,665 sq mi (315,194 km²)  - Width 342 miles (550 km)  - Length 370 miles (595 km)  - % water 0. ... The carat is a unit of mass used for gems, and equals 200 milligrams or 3. ... The Smithsonian castle, as seen through the garden gate. ... For other uses, see Washington, D.C. (disambiguation). ...


Peridot/olivine is the birthstone of August. A birthstone is a gemstone or other semi-precious stone which is associated with a month of the Gregorian Calendar. ... This article does not cite any references or sources. ...


External links

Peridot from the San Carlos Apache reservation in Arizona.

  Results from FactBites:
 
Peridot - english (855 words)
Peridot is also found in Europe in medieval churches, where it adorns many a treasure, for example one of the shrines in Cologne Cathedral.
Peridot from Arizona, where it is popularly used in native American jewellery, often has somewhat yellowish or gold-brown nuances.
The peridot is cut in accordance with its crystal shape, mostly faceted or in classical table cuts, or round, antique, as an octahedron or oval.
Gemstones - Peridot (828 words)
Peridot is the best known gem variety of olivine, a species name for a series of magnesium-iron rich silicate minerals.
The peridot occurs as individual grains and aggregates of grains in a basalt which is about 3 to 35 meters thick that forms the top and sides of Peridot Mesa.
The peridot grains that are commercially recovered are typically 6 to 13 millimeters in size.
  More results at FactBites »

 
 

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