MINERALS INDEX
Neotocite |
| MnO.SiO2.nH2O |
| Amorphous |
Character
Neotocite is black and coal-like but is brown in thin section. Its fracture is conchoidal
and its hardness is about 4. Its refractive index is 1.57 ±0.02.
The neotocite from Franklin has not been analyzed. It is related in composition to serpentine and is probably to be regarded as an alteration product of bementite, but, unlike that mineral, it is invariably amorphous.
Occurrence
A specimen from the Trotter mine, found in the Hancock collection, was identified by
Larsen as neotocite. It forms a vein in limestone. The amorphous material contains a few
needles of what is probably bementite
Similar material was identified in a specimen of calcium larsenite, where it forms a brown border about grayish bementite.
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Website
© by Herb Yeates 1997-2006.
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page created: August 12, 2006 6:42 PM
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