There are numerous occurrences of plagioclase-spinel rocks with spinel grains interstitial to felspars but texturally these bear no resemblance to the ...
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www.springerlink.com/index/RQ78TQ3L3770T361.pdf
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These fields are defined using contoured data density plots based on the spinel prism, and plots of T iO2 vs ferric iron, for mantle xenoliths, ophiolitic rocks, continental layered intrusions, alkalic and lamprophyric rocks, tholeiitic basalts, Alaskan ultramafic complexes and komatiites.
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petrology.oxfordjournals.org/cgi/content/abstract/42/12...
petrology.oxfordjournals.org/cgi/content/abstract/42/12/2279
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KEY WORDS: mantle; melt inclusions; olivine; spinel; volcanic rocks ... Roeder (1994) succinctly reviewed detailed studies over the last 20 years of Cr-spinel in mafic and ultramafic rocks. These studies have shown that spinel compositions are a complex function of magma (and source peridotite) composition (e.g.
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petrology.oxfordjournals.org/cgi/content/full/42/4/655
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Home Page Log In Message Board The Mindat Directory ... Click here to view Spinel data ... Click here to view Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany...
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www.mindat.org/locentry-95457.html
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Compositions of ~2500 spinel-olivine pairs and 400 melt inclusion-spinel pairs have been analysed from 36 igneous suites from oceanic, arc and intraplate tectonic settings. ... Keywords: mantle; melt inclusions; olivine; spinel; volcanic rocks, tectonic provenance...
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eprints.utas.edu.au/00000324/
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Detrital spinel is a widespread heavy mineral in sandstones from the Maastrichtian-Middle Eocene sedimentary basins in the SE Alps. ... Keywords: geodynamic evolution; chromian spinel; volcanic-rocks; igneous rocks; geochemistry; chemistry; ophiolite; petrogenesis; peridotites...
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www-odp.tamu.edu/publications/149_IR/chap_04/c4_f38.htm
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Spinel At Crystals, Rocks and Gems ... Black Spinel: Fosters protection. Black spinel is the opaque jet black variety of spinel. Black spinel is the premier black gemstone. With a hardness of 8, it's extremely durable. Black spinel lacks the metallic luster of hematite or black ... Crystals, Rocks and Gems Home Page...
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www.crystalsrocksandgems.com/Healing_Crystals/Spinel.ht...
www.crystalsrocksandgems.com/Healing_Crystals/Spinel.html
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Use Spinel in a Sentence ... A hard, variously colored mineral with composition MgAl2O4, having usually octahedral crystals and occurring in igneous and carbonate rocks. The red variety is valued as a gem and is sometimes confused with ruby.
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dictionary.reference.com/browse/Spinel
dictionary.reference.com/browse/Spinel
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