Results 71 to 80 of about 145 (96)

Chemistry and genesis of Ree bearing gemstones from the North West Frontier Province, Pakistan

Alkaline granites have high K + Na vs Si ratios. Some of the best studied of these are in the Kola Province of NW Russia where they are characterized by high Rare Earth Element (REE) concentrations which stabilize a remarkable range of rare REE-rich ...
Khan, Ehtesham Ullah
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The thermodynamic properties of bastnäsite-(Ce) and parisite-(Ce)

Chemical Geology, 2015
Abstract The rare earth elements (REE) are critical metals that play a major role in emerging high technology and green industries. The light (L)REE occur dominantly in fluorocarbonate minerals and consequently information on the stability of these minerals is essential for a better understanding of the genesis of REE deposits and for the efficient ...
Alexander P Gysi, Anthony E Williams-Jones   +1 more
exaly   +2 more sources

Zeta potentials of the rare earth element fluorcarbonate minerals focusing on bastnäsite and parisite [PDF]

Advances in Colloid and Interface Science, 2018
This is the final version of the article. Available from Elsevier via the DOI in this record.Rare earth elements (REE) are critical to a wide range of technologies ranging from mobile phones to wind turbines.
Camilla L Owens, G R Nash, K Hadler
exaly   +3 more sources

New Insights into the Depressive Mechanism of Sodium Silicate on Bastnaesite, Parisite, and Fluorite: Experimental and DFT Study

Minerals (Basel, Switzerland)
The surface properties of bastnaesite and parisite are similar to their associated gangue mineral, fluorite, which makes the flotation separation of these two rare earth minerals from fluorite one of the industry’s most significant challenges. This
Jieliang Wang, Zhao Cao
exaly   +2 more sources

Bastnasite-(Ce) and parisite-(Ce) from Mount Malosa, Malawi

, 2010
GUASTONI, ALESSANDRO, KONDO D, NESTOLA, FABRIZIO   +2 more
openaire   +2 more sources

Determination of six new polytypes in parisite-(Ce) by means of high resolution electron microscopy

Mineralogical Magazine, 2001
AbstractThe ultrastructures of parisite-(Ce) from a rare-earth mineral deposit of Sichuan Province, southwest China, have been observed and investigated by selected area electron diffraction (SAED) and high resolution electron microscopy (HREM). Six new polytypes 4H, 10H, 16H, 18R, 24R and 30R were determined in parisite-(Ce), as were their crystal ...
Meng Dawei, Wu Xiuling, Mou Tao, Li Douxing   +3 more
openaire   +1 more source

MICROSTRUCTURAL INVESTIGATION OF NEW POLYTYPES OF PARISITE-(Ce) BY HIGH-RESOLUTION TRANSMISSION ELECTRON MICROSCOPY

The Canadian Mineralogist, 2001
Five new polytypes of parisite-(Ce) [CaCe2(CO3)(3)F-2] from a rare-carth-mineral deposit within an aegirine-bearing granite pluton in Sichuan Province, southwestern China, were found by HRTEM: 6R(2), 8H, 14H, 36R and 42R. These new polytypes are all long-period ordered stacking structures, which may result from the distribution and the periodic ...
D. Meng, X. Wu, T. Mou, D. Li
openaire   +1 more source

The crystal structure of parisite-(Ce), Ce₂CaF₂(CO₃)₃

American Mineralogist, 2000
The crystal structure of parisite–(Ce) was solved and refined to R = 0.044, Rw = 0.037 using three–dimensional X–ray diffraction data (XRD). In contrast to the putative hexagonal cell, weak XRD maxima on precession films demonstrate that the parisite–(Ce) is monoclinic with a space group C 2/ c or Cc .
Yunxiang Ni, Jeffrey E. Post, John M. Hughes   +2 more
openaire   +1 more source

REE-carbonates from alkaline pegmatites of Mount Malosa, Malawi: crystal chemistry and genetic inferences of basnasite-(Ce), parisite-(Ce) and synchysite-(Ce)

, 2008
GUASTONI, ALESSANDRO, NESTOLA, FABRIZIO, GIARETTA A.   +2 more
openaire   +2 more sources