Peridot
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What are some important uses of the mineral peridot?
The chemical formula is (Mg,Fe)2 SiO4.
Basically, it is used as an abrasive in sandblasting.
Let me give you some info regarding this mineral:
Peridot is used as a Gemstone. Mg-rich olivine is used in refractory sand and brick in the casting industry because of its high melting point.
Peridot is the birthstone for the month of August.
The astrological signs of peridot are Virgo, Leo, Libra, Scorpio and Sagittarius.
Peridot is a Gem variety of the olivine mineral group. The olivines are isomorphous (all have the same Crystal structure), with varying chemical compositions. The most common of the olivines have chemical compositions in the complete solid solution series between pure forsterite (Mg2SiO4) and pure fayalite (Fe2SiO4). A less common solid solution series also exists between the olivine varieties fayalite (Fe2SiO4) and tephroite (Mn2SiO4). Another uncommon solid solution series exists between monticellite (CaMgSiO4) and kirschteinite (CaFeSiO4). The naturally occurring pure calcium chemical end member larnite (Ca2SiO4) does not have the olivine structure.
The green color of peridot, the gem variety of olivine, is mainly dependent on the amount of ferrous iron present, this color then being modified by trace amounts of Fe3+, Ti4+ and Ni2+. The better green colors occur with a Fe:Mg ratio of about 1:8. Higher concentrations of Fe result in less desirable yellow-green or brownish green shades. Pure brown peridots are more rare. Peridot gems have a hardness of about 6.5, which makes them very suitable for use as Gemstones in earrings, brooches and pendants. Their use as ringstones requires some extra care to prevent abrasion and loss of polish.
The name olivine is from the latin oliva in reference to the mineral's color. Peridot is from a thirteenth century English word peridote.
From ancient times until the eighteenth century, peridot was referred to as 'topazion' or 'topaz', most likely because it was found on the island of Topazios (known today as Zebirget or Isle of St. John in Egypt) in the Red Sea. In the eighteenth century the name topaz was given to our mineral topaz of today, and gem olivine became known as peridot. Yellowish peridot also has been commonly referred to as chrysolite which is from Greek meaning yellow stone. The term chrysolite has also been commonly used in refering to greenish-yellow gem chrysoberyl.
Hope this helps!!!
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