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or bast·näs·ite also bast·nas·ite  (băst′nə-sīt′)
A yellowish to reddish-brown mineral, (Ce,La, Y)CO3F, that is a source of several rare-earth elements including gadolinium, samarium, and neodymium.

[After Bastnäs, a mine in south-central Sweden.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.bastnasite - a yellow-to-brown mineral that is a source of rare earth elements
atomic number 58, Ce, cerium - a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group
atomic number 60, Nd, neodymium - a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium
atomic number 59, Pr, praseodymium - a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
atomic number 62, samarium, Sm - a grey lustrous metallic element of the rare earth group; is used in special alloys; occurs in monazite and bastnasite
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
These may include fluorocarbonates (bastnasite and synchysite) and even REE-bearing fluorite.
There are many mineral sources from where REE could be extracted but mostly from two main types-Monazite and Bastnasite. Sri Lanka is among the nine countries with monazite deposits and considered only second to China's.
Rare earth carbonate minerals synchysite and bastnasite have been observed in samples of fresh, unweathered carbonatite beneath this weathered profile.
It is found in a number of minerals, the most important being monazite and bastnasite. Average Ce content in Buriganga river sediment is 105.5 [micro]g [g.sup.-1], which is higher than that of standard values.
In the Mineral Sector 85% area of FATA had been geologically explored where prospects for a number of precious minerals including oil, gas, gold, copper, manganese, chromites, granite, Bentonite, gypsum and Bastnasite had been positive and promising.
The largest percentage of worldwide rare earth economic resources correspond to Bastnasite deposits in China and the U.S., while the second largest portion is comprised of monazite deposits in Australia, Brazil, China, India, Malaysia, South Africa, Sri Lanka, Thailand, and the U.S.
The Ambatofinandrahana region is most famous for quartz with and without inclusions, epitactic hematite on rutile, bastnasite, tourmaline and beryl, including huge crystals of aquamarine, with dumortierite crystals, encased in solid pegmatite.
Compared with published values from seawater near Japan (Alibo & Nozaki 1999) our Ce concentrations were an order of magnitude higher (0.01-0.04 ppb), however we suspect that higher levels of Ce found in our seawater samples from coastal CA relates to the anthropogenic influence of mining of Ce-rich minerals like bastnasite and monazite for use in the petroleum industry (Olmez et al.
However, in bastnasite and monazite -- minerals that serve as the two major commercial rare-earth sources -- the relative ratios of rare-earth metals are dramatically skewed from that otherwise constant pattern, which geochemists call the "crustal abundance."
Results from an initial five RC samples studied identify bastnasite as the main rare earth mineral present.