from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The mineral form of black iron oxide, Fe3O4, that often occurs with magnesium, zinc, and manganese and is an important ore of iron.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A magnetic mineral, Fe3O4, one of the primary ores of iron. It has also been called lodestone.
from the GNU version of the Collaborative International Dictionary of English
- n. An oxide of iron (Fe3O4) occurring in isometric crystals, also massive, of a black color and metallic luster. It is readily attracted by a magnet and sometimes possesses polarity, being then called loadstone. It is an important iron ore. Called also magnetic iron.
from The Century Dictionary and Cyclopedia
- n. Magnetic oxid of iron; a black oxid of iron (Fe3O4 or FeO.Fe2O3) which is strongly attractable by a magnet.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an oxide of iron that is strongly attracted by magnets
Sorry, no etymologies found.
These mineral crystals were identified as magnetite, pyrrhotite, and greigite.
In 1948, Néel made another fundamental discovery with his explanation of the strong magnetism found in the ferrite materials, of which magnetite is one.
Like PAHs, these minerals -- mainly iron compounds called magnetite and pyrrhotite -- can come from inorganic sources.
Spoornet spokesman Molatwane Likhethe said these two mines produced a waste product called magnetite, containing about 55 percent iron ore.
It is, of course, a self-evident fact that the magnetic iron ore, which is a form of peroxide, commonly known as magnetite, or lodestone, has the power of attracting a magnet when swinging free, or of being attracted by a magnet, to account for which many plausible reasons have been advanced.
The copper at Hillside has a close association with the mineral magnetite, which is the cause of the magnetic anomaly.
Further resource drilling for the eastern extension is planned, where previous drilling undertaken has shown that the quality of the magnetite is the same as that in the western portion of the deposit.
Very seldom is the obsidian colorless; most often it's very dark or black due to impurities such as magnetite and hematite, both being iron oxide variations.
Certain minerals, such as magnetite, ilmenite, spinel, corundum, etc., are often found as primary segregations within the mass of igneous rock.
Previous research demonstrated that arsenic can be removed from water using activated carbon or iron minerals, such as magnetite nanocrystals.