Manganite |
| Mn2O3.H2O |
| Orthorhombic |
Forms
a(100), k(230), and u(101)
Occurrence
Manganite was found at Franklin in pillar 859, 20 feet below the 800-foot level south,
about 75 feet from the footwall, in a vein in limestone with a network of vugs lined with
calcite crystals, some of which were very brilliant. Implanted on the calcite are clusters
of slender radiating needles of black lustrous manganite. The crystals are much striated
and gave poor measurements, but the presence of the forms listed above was established. In
another specimen the manganite crystals lined cavities in massive yellow andradite.
Chemical tests confirmed these crystals as manganite.
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Figure 50 Simple prismatic crystal of manganite showing the forms a(100), k(230), and u(101). Franklin. |
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Manganite was doubtfully reported by Brush (95) at Franklin, associated with sussexite. Examination of the original specimens makes it certain that his material is oxidized pyrochroite. A specimen of what is probably manganite, pseudomorphic after pyrolusite, was found in the Canfield collection, but its source is unknown.
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Website
© by Herb Yeates 1997-2006.
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page created: August 12, 2006 6:32 PM
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