bastnaesite

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bastnaesite

[′bast·nə‚sīt]
(mineralogy)
(Ce,La)CO3(F,OH) A greasy yellow to reddish-brown fluorocarbonate rare-earth metal mineral; source of rare earths, for example, cerium and lanthanum.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Phonolite sills Cavities Sill Dikes* Lime Mineral Quarry Upper Lower Rock Cavities Rock stone Aegirine R R Albite C VC C Almandine VR VR Amphibole group C VC Analcime C R VC VR R Anatase VR VR VR VR Ankerite C C R Apatite group VR R VR R Baddeleyite VR ER VR Barite C R C VR Bastnasite series ER ER Biotite group VR ER VR C Brookite R R R Calcite VC VC VC C R VC Celestine C R VC VR Cerussite ER ER Chromite ER ER Cristobalite R R VR Crocoite ER ER Cryolite R R R Dachiardite-Na ER ER ER Dawsonite VC VC VC VC VR Dickite ER ER Dolomite R VR R R C Doyleite VR VR VR Dresserite C C Elpidite VR VR Fluorite VC C VC ER R Franconite ER ER Galena R R R Garronite-like m.
Bastnasite was described by Hisinger (1838) under the name of "basiskt fluor-cerium" (basic fluorine-cerium), although Berzelius (1825) reports an orange-yellow "flusspatsyradt cerium" in what is likely the earliest published notice of the mineral.
Both Hisinger (1838) and Nordenskiold (1868) report that bastnasite is very rare at Bastnas.
Bastnasite is found as yellow plates, masses and grains filling the interstices between allanite plates and within allanite masses.
Cerite has a flesh-red to gray color and occurs as large, dense masses up to 30 cm, associated with amphiboles, allanite, bastnasite and tornebohmite.
As early as February 1999, very fine crystals of bastnasite and other unusual minerals had begun to appear on the market in Peshawar.
Although Zagi Mountain has produced most of the bastnasite and other rare minerals, a number of matrix specimens have come recently from Tor Ghar or Torghur (Black Mountain), a ridge northwest of Zagi and south of the Kabul River in the Khyber FATA.
The bastnasite and accompanying minerals are found over a wide area in collapsed pockets in the heavily weathered rock and in the alluvium associated with it.
Digging for bastnasite at Zagi Mountain began around late 2000 and increased tremendously in early 2002.
The Trimouns talc-chlorite deposit is a mineral locality of international significance, producing fine crystal specimens of rare earth element-bearing species including allanite/dissakisite, bastnasite, synchisite, parisite, hingganite and iimoriite.
Allanite/dissakisite can be associated with bastnasite, synchisite, parisite, quartz, calcite, and very rarely with hingganite.
Three types of bastnasite have been found at the site.