Martite
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Related to Martite: hematite
martite
[′mär‚tīt] (mineralogy)
Hematite occurring in iron-black octahedral crystals pseudomorphous after magnetite.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
Martite
a mineral, the product yielded upon conversion of magnetite, Fe3O4 into hematite, Fe2O3. The crystals and crystalline grains of magnetite, upon conversion into martite, are usually replaced, without alteration of their original form, by finely aggregated hematite and exhibit the physical properties characteristic of the latter. Martite forms during the oxidation of magnetite in the weathering zone of the earth’s crust as well as deep within the earth under conditions characterized by increased oxidation potential of hydrothermal solutions surrounding the previously formed magnetite. Martite ores are high-grade iron ores.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.