Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy An
cubic form ofolivine produced under very highpressure , (Mg ,Fe 2+)2Si O 4.
Etymologies
Sorry, no etymologies found.
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Examples
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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Although ferromagnesian silicate spinels (such as ringwoodite) were later found to break down to simple oxides or stishovite plus perovskite, several post-spinel oxides experimentally convert into a single phase with the CaFe2O4-type and CaTi2O4-type structures.
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Forty years ago, in search for denser polymorphs of the then experimentally discovered silicate spinel (ringwoodite) and modified spinel (wadsleyite) that are stable at the pressure and temperature conditions of the Earth's transition zone, scientists started to search for a post-spinel phase denser than spinel which may appear at much higher pressure.
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Forty years ago, in search for denser polymorphs of the then experimentally discovered silicate spinel (ringwoodite) and modified spinel (wadsleyite) that are stable at the pressure and temperature conditions of the Earth's transition zone, scientists started to search for a post-spinel phase denser than spinel which may appear at much higher pressure.
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Forty years ago, in search for denser polymorphs of the then experimentally discovered silicate spinel (ringwoodite) and modified spinel (wadsleyite) that are stable at the pressure and temperature conditions of the Earth's transition zone, scientists started to search for a post-spinel phase denser than spinel which may appear at much higher pressure.
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In the same places where ringwoodite comes from: pieces of broken planets-meteorites.
About.com Geology 2008
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Olivine, for example, turns to the spinel mineral ringwoodite.
About.com Geology 2008
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Most spinel minerals just break down-for instance, ringwoodite decomposes at depths of about 660 kilometers.
About.com Geology 2008
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