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Peridot is a semi-precious chrysolite or olivine mineral gemstone that sits between 6.5-7 on the Mohs hardness scale. How is peridot formed? It is one of the only semi-precious gemstones not formed in the Earth's crust but in the molten rock of the Earth's upper mantle.
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Olivine Gem variety of the mineral olivine: found in peridotite rock from the earth's upper mantle. Facts Mineral: Olivine Chemistry: (MgFe) 2 SiO 4 Color: Yellowish green Refractive index: 1.65 to 1.69 Birefringence: 0.035 to 0.038 Specific gravity: 3.34 Mohs Hardness: 6.5 to 7 Treatments
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Peridot is the rare gem-quality variety of the common mineral olivine, which forms deep inside the Earth's mantle and is brought to the surface by volcanoes. In Hawaii, peridot once symbolized the tears of Pele, the volcano goddess of fire who controls the flow of lava. Rarely, peridot is also found inside meteorites.
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Technically, the peridot is used only for gem-quality stones in this range. Peridots are known by the equation Mg2SiO4: Implying their magnesium-rich character. However, they can also be found in another mineral olivine combination known as fayalite: which is recognised by the equation: Fe2SiO4. Which technically makes the olivine a mineral.
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Peridot is the name given to gem quality olivine. It is a magnesium iron silicate and crystallises in the orthorhombic system. Although is hardness is 6.5, its vibrant lime green colour, resulting from a perponderance of magnesium over iron, makes it a sought after gemstone.
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Physical Properties: Chemistry: Peridot is a magnesium iron silicate with the chemical formula (Mg,Fe)2SiO4 Crystal System: Peridot crystallizes in the orthorhombic crystal system Hardness: Peridot has a hardness of 6.5-7 on the Mohs scale Lustre: Peridot has a vitreous lustre, meaning it has a glass-like appearance when polished
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Peridot is one of the oldest known gemstones, and has been mined as a gem for over 4,000 years. It is actually mentioned several times in the Bible, although you may not recognise the name as it is referred to by its original title, Chrysolite.
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Peridot is a silicate, usually found in shades of olive green to yellow-green or bright spring green. It has a vitreous luster and is transparent to translucent. Peridot measures 6.5-7 on the Mohs scale for hardness. Chemical composition is typically (Mg, Fe)2SiO4. Ca, Mn, and Ni rarely occupy the Mg and Fe positions.
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Peridot ( / ˈpɛrɪˌdɒt, - ˌdoʊ / PERR-ih-dot, -doh ), sometimes called chrysolite, is a yellowish-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle.
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Photo © Peridots belong to the forsterite-fayalite solid-solution , which forms part of the of minerals. Forsterite is the magnesium (Mg)-dominant end, while fayalite is the iron (Fe)-dominant end. The term refers to green, gem-quality olivines of this series.
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How does peridot compare to other gemstones? Peridot is a unique and beautiful gemstone that is prized for its rich, vibrant green colour. It is a relatively hard gemstone, ranking 6.5 to 7 on the Mohs scale of mineral hardness, which makes it suitable for everyday wear. Peridots are also relatively affordable compared to some other gemstones.
Peridot
Peridot (pronounced pair-uh-doe) is the gem form of Olivine, a magnesium iron silicate mineral of the forsterite-fayalite family, with the amount of iron being responsible for the color. While Olivine is an abundant mineral, gem-quality Peridot is rather rare, especially in larger stones.
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Peridot is a gemstone. Its restful, soothing shade brings calm and harmony to the wearer. With a joyful green gleam, it's said to create a friendly state of mind to improve health and relationships. Darker peridot gems have a rich, velvety shine, giving them a slicker, sleepier luster.
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