from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A brownish-bronze iron sulfide mineral, FeS, characterized by weak magnetic properties and used as an iron ore and in the manufacture of sulfuric acid. Also called magnetic pyrites.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A weakly magnetic ferrous sulfide mineral, FeS.
from The Century Dictionary and Cyclopedia
- n. Same as pyrrhotine.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a brownish iron sulfide mineral (FeS) having weak magnetic properties
• A few minerals are magnetic such as pyrrhotite and magnetite.
Like PAHs, these minerals -- mainly iron compounds called magnetite and pyrrhotite -- can come from inorganic sources.
However, inorganic precipitation of magnetite and pyrrhotite require just the opposite conditions: high pH rather than low acidic pH conditions.
These mineral crystals were identified as magnetite, pyrrhotite, and greigite.
In essence, the researchers hold that the combination of magnetite, pyrrhotite, and carbonate could not have formed nonbiologically.
Marcasite and pyrrhotite, other iron sulphide minerals, are frequently found with pyrite and are used for the same purposes.
The target for all drilling on the Eastern Extension property is smoky quartz veins mineralized with sulphides pyrite, pyrrhotite, chalcopyrite, sphalerite ± visible gold.
Variable amounts of pyrrhotite and chalcopyrite occur, with lesser amounts of sphalerite and magnetite.
The tested EM anomalies immediately up-ice of the Suitcase boulders are attributed to Fe sulphide (pyrrhotite) mineralization.
The property features copper-silver-molybdenum-lead-zinc-gold bearing sulphide minerals which include chalcopyrite, pyrrhotite, pyrite, molybdenite, sphalerite, galena and covelite.
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