|
Search over 100 encyclopedias and dictionaries: |
Research categories | Follow us on Twitter |
Research categories
View all topics in the newsView all reference sources at Encyclopedia.com |
|||
ilmenite
ilmenite Mineral, FeTiO3; sp. gr. 4.5–5.0; hardness 5–6; trigonal; black; black to brownish-red streak; sub-metallic lustre; crystals normally thick and tabular, but often massive and compact; no cleavage; magnetic; occurs as an accessory mineral in igneous rocks, e.g. gabbro and diorite, in quartz veins and pegmatites, in gneisses, in association with hematite and chalcopyrite, and because it is resistant to weathering it occurs extensively in alluvial deposits with magnetite, monazite, and rutile. It is used as a source of iron and titanium. The name is derived from that of the Ilmen Mountains, Russia.
|
|
|
Cite this article
AILSA ALLABY and MICHAEL ALLABY. "ilmenite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "ilmenite." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1O13-ilmenite.html AILSA ALLABY and MICHAEL ALLABY. "ilmenite." A Dictionary of Earth Sciences. 1999. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-ilmenite.html |
|
ilmenite
ilmenite , black mineral, iron titanium oxide, FeTiO 3 , crystallizing in the hexagonal system. It is sometimes found as tabular hexagonal crystals but occurs more commonly as small grains in igneous and metamorphic rocks and in sands derived from them. Ilmenite has been noted as an important constituent of lunar rocks. It is the commonest titanium mineral and is the most important source of this element and its compounds. Over 3 million tons of ilmenite are mined annually; important producers are the United States, Canada, Australia, and Norway. |
|
|
Cite this article
"ilmenite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. 11 Feb. 2012 <http://www.encyclopedia.com>. "ilmenite." The Columbia Encyclopedia, 6th ed.. 2008. Encyclopedia.com. (February 11, 2012). http://www.encyclopedia.com/doc/1E1-ilmenite.html "ilmenite." The Columbia Encyclopedia, 6th ed.. 2008. Retrieved February 11, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-ilmenite.html |
|
|
Search over 100 encyclopedias and dictionaries:
HighBeam™ Research, Inc. © Copyright 2012. All rights reserved.
The Encyclopedia.com advertising network includes:
