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MnSiO3
Tricinic
Pyroxmangite occurs sparingly at both Franklin and Sterling Hill, but has been little studied.
Pyroxmangite is pink to brownish pink, with two good cleavages and vitreous luster. There is no discernible fluorescence in ultraviolet. It is distinguished from rhodonite only by very careful optical or X-ray examination. Locally, rhodonite is by far the preponderant mineral.
Pyroxmangite is a manganese silicate of the pyroxenoid group and is the high-temperature polymorph of MnSiO3. Partial analyses of material from Franklin and Sterling Hill are given in Table 10.
At Franklin, pyroxmangite occurs with andradite as massive gray material, which serves as a host for abundant (exsolved?) microcrystals of gahnite (#161161). It also occurs, associated with scheelite and fluorapatite, on specimens found on the Trotter Dump in Franklin.
At Sterling Hill, pyroxmangite occurs as light pink massive material associated with tirodite, spessartine, calcite, black willemite, and minor mica, on the 700 level. It has also been found on the 1750 level, as light pink material associated with spessartine, calcite, tirodite, and rhodonite.
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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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