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Mineralpedia Details for Bastnasite-(Ce)

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Bastnasite-(Ce)

Bastnasite-(Ce)

Named for the type locality at the Bastnas mines in Vastmanland, Sweden and for the dominance of cerium over the other rare earth elements in the composition. Bastasite-Ce is an uncommon mineral, but is the most common rare earth bearing mineral. It is usually a hydrothermal mineral although it is possible to be a primary mineral as well. It can be found in granite, alkali syenites and pegmatites, carbonatites, contact metamorphic deposits, and as a detrital mineral in placer deposits. Localities include in, additionally, France, Turkey, Afghanistan, Pakistan, Madagascar, Burundi, Zambia, the United States, Canada, China, and several others. Bastnasite-Ce has a dark red cathodoluminescence. It is strongly piezoelectric and generated a charge in response to pressure.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/bastnasite-(Ce).pdf

Formula
CeCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
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Bastnasite-(Ce) from Zegi Mountain, Khber Agency, FATA, Pakistan

Bastnasite-(Ce)
            from Zegi Mountain, Khber Agency, FATA, Pakistan

A cluster of flat, very short prismatic crystals with beveled edges representing the pyrimidal faces. The largest crystal of the group is 1.2cm across. There are a few Aegerine needles attached to the crystals.

This specimen features three crystals to 1.2 and 1cm with the third only exposed as a termination. There are in two other crystals; one is shown as a tiny 2mm crystal in front. The other is exposed on the backside. All are terminated with slight beveled edges and are reddish brown and glassy with good luster. The matrix is the actual country rock of what is called the "High Himalayan Crystalline Zone", which is a gneissic alkaline granite composed of microcline, aegeriene, riebeckite and quartz.

A large Bastnasite crystal to 1.6cm, terminated with beveled edges in alkaline riebeckite rich granite matrix.

Deep red glassy prismatic crystal to 1.8cm with complex termination.

Deep red, hexagonal crystal with complex termination - 1.6cm.

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Bastnasite-(Ce) from Lagmannsvik, Hamarøy, Nordland, Norway

Bastnasite-(Ce)
            from Lagmannsvik, Hamarøy, Nordland, Norway

Pervasive brownish red grains suspended in matrix.

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Bastnasite-(Ce) from Torghar, Khyber Agency, FATA, Pakistan

Bastnasite-(Ce)
            from Torghar, Khyber Agency, FATA, Pakistan

An incredibly large, deep red prismatic crystal to 4cm, terminated with a smaller 2cm crystal adjoined at the side also terminated. Contains unknown inclusions. This is the premier locality for this species.

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Bastnasite-(Ce) from Mountain Pass mine, San Bernardino Co., California, United States

Bastnasite-(Ce)
            from Mountain Pass mine, San Bernardino Co., California, United States

Very rich specimen loaded with brown, massive Bastnasite from this world class REE deposit.

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Bastnasite-(Ce) from Trimouns Talc mine, Luzenac, Ariège, Midi-Pyrénées, France

Bastnasite-(Ce)
            from Trimouns Talc mine, Luzenac, Ariège,  Midi-Pyrénées, France

Possibly one of the best localities for Bastnasite. A superb, well crystallized rosette 1cm across. Ex. Kay Robertson & Scott Williams collection. See Prov. tab.

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