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Mineralogical ClassificationGatelite-(Ce)

12th Apr 2005 12:33 UTCJim Ferraiolo

AmMin 88,223-228(2003):

Gatelite-(Ce), ideally (Ca1REE3)S=4S=43(O,F) (OH,O)2, is a

newly identified mineral from the Trimouns talc deposit, Luzenac, Ariège, French Pyrenees. The

mineral occurs as striated colorless crystals finely intergrown with minute lamellae of törnebohmite-

(Ce). Associated minerals include pyrite, aeschynite-(Y), dolomite, törnebohmite-(Ce), dissakisite-

(Ce), talc, and quartz. Gatelite-(Ce) is insoluble in HCl, relatively hard (Mohs hardness 6–7), brittle

with irregular fracture, and exhibits good {100} and imperfect {001} cleavages. Gatelite-(Ce) is

monoclinic, space group P21/a, with the following unit-cell parameters: a = 17.770(4), b = 5.651(1),

c =17.458(4) Å, b =116.18(2)∞, V = 1573.3(6) Å3, and Z = 4. The strongest five powder-diffraction

lines are 15.67 (87) (001); 3.49 (50) (4–12); 2.97 (100) (2–15); 2.83 (44) (020); and

2.61 (56) (6–12). Electron-microprobe analysis supported by single-crystal structure determination

yielded the following empirical formula: (Ca1.09La0.54Ce1.36Pr0.14Nd0.75Sm0.11Dy0.01Y0.04)S4.04 (Al3.06Mg0.51

Fe2+

0.32Nb0.01)S3.90 Si5.06 O20.26 (OH)1.60 F0.14. The calculated density (from the empirical formula) is 4.51 g/

cm3.

12th Apr 2005 14:21 UTCPeter Haas

Thanks, Jim.

Just added.
 
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