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FeAl2O4
Cubic
Hercynite, an iron aluminum oxide mineral of the spinel group, is a relatively rare mineral locally and has been little studied. It was first reported by Parker (1983), who noted that hercynite was found as dark reddish brown to black 1 cm crystals, associated with phlogopite and norbergite in the Franklin Quarry, formerly known as the Farber Quarry. It was verified as hercynite using a combination of X-ray diffraction and EDAX analysis. An analysis of chromian material is presented in Table 21. Hercynite is also found as the core of some chromian gahnite specimens from near the Sterling Hill orebody (Dunn and Frondel, 1990) and is discussed above with gahnite. Hercynite has not been found in the orebodies; it is a mineral of the Franklin Marble.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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