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American Mineralogist; August 1983; v. 68; no. 7-8; p. 777-789
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Exsolution in metamorphosed chromite from the Red Lodge District, Montana

Patricia J. Loferski, and Bruce R. Lipin

U. S. Geol. Surv., Reston, VA, United States

Three textural types of exsolved chromites. Type A grains consist of an Al-rich host that contains blebs and rare smaller lamellae of an Fe-rich guest; type B grains have an Fe-rich host that contains blebs and dense networks of lamellae of an Al-rich guest; type C grains contain a very fine intergrowth of Al- and Fe-rich lamellae. Miscibility gap in the spinel prism is tunnel-shaped and extends from the Fe 3 O 4 -FeAl 2 O 4 -FeCr 2 O 4 face to the MgFe 2 O 4 -MgAl 2 O 4 -MgCr 2 O 4 face. If exsolution began at or near the peak temperature of regional metamorphism in the eastern Beartooth Mountains, the temperature of unmixing was near 600 degrees C.--Modified journal abstract.

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