Day #47 Deskcrop: Chromite Ore

Following yesterday’s theme of not-quite-economic resources, today’s deskcrop is a piece of nearly pure chromite ore (chromatite) from the Stillwater Intrusive Complex in the Beartooth Mountains of southern Montana. Last mined economically during the Korean War, the chromite deposits of the Stillwater Intrusion are not nearly as economical to mine today as those of the massive Bushveld Intrusion of South Africa. Nevertheless, they are part of a much more accessible locality for North American geologists who wish to study the field relationships and igneous processes of layered mafic intrusions (LMIs).

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Chromite Ore

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