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enstatite |
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enstatiteCommon silicate mineral in the pyroxene family. It is the stable form of magnesium silicate (MgSiO3, often with up to 10% iron) in magnesium- and iron-rich igneous rock types. Enstatite crystallizes in the orthorhombic system (three unequal axes at right angles to each other). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Orthopyroxene forms in primitive (high-MgO) basalts but as differentiation proceeds, it is replaced by pigeonite once the enstatite component falls below 60 to 70 atomic percent. That mineral also predominates in a group of meteorites called enstatite achondrites. Thermometry of the A15/4 diopside using the enstatite solvus (Nimis & Taylor 2000) indicates at least 42% of grains in the diamond zone. |
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