Taipingite-(Ce), (Ce73+, Ca2)Σ9Mg(SiO4)3[SiO3(OH)]4F3, a new mineral from the Taipingzhen REE deposit, North Qinling Orogen, central China

Qu, Kai; Sima, Xianzhang; Fan, Guifen; Li, Guowu; Shen, Ganfu; Chen, Huakai; Liu, Xing; Yin, Qingqing; Li, Ting; Wang, Yanjuan

doi:10.1016/j.gsf.2020.02.006

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…4). In taipingite-(CeCa), (Ce 7 Ca 2 )Mg(SiO 4 ) 3 [SiO 3 (OH)] 4 F 3 (Qu et al , 2020), these sites are instead ten-fold coordinated and in cerite-(CeCa), (Ce 7 Ca 2 )Mg(SiO 4 ) 3 [SiO 3 (OH)] 4 (OH) 3 (Moore and Shen, 1983), they are eight-fold-coordinated. Fluorine is involved in coordination with the A 1 and A 3 sites.…”

Section: Description Of the Crystal Structure And Discussionmentioning

confidence: 99%

Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals

Campostrini

Demartin

Finello

et al. 2023

MinMag

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Aluminotaipingite-(CeCa), (Ce6Ca3)Al(SiO4)3[SiO3(OH)]4F3, is a new member of the cerite-supergroup minerals, whose general chemical formula is A9XM[TO3Ø]7Z3, (A = REE, Ca, Sr, Na and □; X = □, Ca, Na and Fe2+; M = Mg, Fe2+, Fe3+, Al and Mn; T = Si and P; Ø = O and OH; Z = □, OH and F). It was found in cavities of a leucogranitic orthogneiss at the Casette quarry, Montoso, Bagnolo Piemonte, Cuneo Province, Piedmont, Italy. Crystals of aluminotaipingite-(CeCa) are light pink to pink, transparent or semi-transparent, with a vitreous lustre. It forms pyramidal crystals up to 0.07 mm in size and observed forms are {0 0 1}, {1 0 $\bar{2}$ }. The tenacity is brittle, no distinct cleavage is observed and the fracture is uneven. The mineral does not fluoresce in long- or short-wave ultraviolet light. The streak is white. Hardness (Mohs) = 5. The calculated density is 4.476 g cm–3. The mineral is trigonal, space group R3c, with a = 10.658(3), c = 37.865(9) Å, V = 3725(2) Å3 and Z = 6. The eight strongest powder X-ray diffraction lines are [dobs, Å (I, %) (h k l)]: 8.38(29)(0 1 2), 4.499(28)(2 0 2), 3.282(41)(2 1 4), 2.936(100)(0 2 10), 2.816(51)(1 2 8), 2.669(37)(2 2 0), 2.207 (29)(3 0 12) and 1.935(35)(2 3 8). The structure was refined to R =0.0306 for 2297 reflections with I >2σ(I). The crystal structure of aluminotaipingite-(CeCa) contains two nine-fold coordinated sites (A1 and A2), which are occupied mainly by lanthanides, and a third nine-fold coordinated A3 site containing almost equal amounts of lanthanides and Ca. The X site is vacant and at the octahedral M site aluminium prevails over Fe3+. Among the three independent T sites, T2 belongs to a (SiO4)4– anion, whereas T1 and T3 belong to (SiO3OH)3– anions. Fluorine is involved in coordination with the A1 and A3 sites.

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Section: Description Of the Crystal Structure And Discussionmentioning

confidence: 99%

Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals

Campostrini

Demartin

Finello

et al. 2023

MinMag

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“…REE geochemistry is an important factor that helps to examine detailed geochemistry processes [21][22][23][24][25][26][27]. La/Yb ratio is considered to indicate LREE and HREE fractionation, whereas La, Ce and Eu anomalies represent magmatic or hydrothermal fluid redox conditions [28][29][30][31][32][33]. The Tongshankou deposit also has a porphyry system that is related to oxidized magma [2,3,6,12,34].…”

Section: Rare Earth Element Geochemistrymentioning

confidence: 99%

“…whereas La, Ce and Eu anomalies represent magmatic or hydrothermal fluid redox conditions [28][29][30][31][32][33]. The Tongshankou deposit also has a porphyry system that is related to oxidized magma [2,3,6,12,34].…”

Section: Rare Earth Element Geochemistrymentioning

confidence: 99%

Texture and Geochemistry of Scheelites in the Tongshankou Deposit in Daye, Hubei, China: Implication for REE Substitution Mechanism and Multistage W Mineralization Processes

Zhao

Wang

et al. 2021

Minerals

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The Tongshankou skarn deposit in the Edong ore district is a typical metasomatic deposit associated with adjacent granodiorite porphyry and carbonate rocks. Using comprehensive microscopic observations, mineralogical and geochemical analysis, scheelite grains in the skarns can be classified into three major types, showing multi-stage mineralization characteristics. In the redox fluid environment, scheelites that occur with garnets usually have affinity to garnets, while in later skarn phases others exist with oxides and sulfides. They can be subdivided by trace elements, such as Nb and Eu, to discuss the detailed ore-forming process. Scheelites have three typical substitution mechanisms including: 2Ca2 + ⇌ REE3 + +Na+ (1); Ca2 + + W6 + ⇌ REE3 + +Nb5+(2); and 3Ca2 + ⇌ 2REE3++ □Ca (□Ca = Ca site vacancy) (3). Plagioclase or various hydrothermal stages can cause Eu anomalies to fluctuate from positive to negative, and these processes can cause particular zonation in W and Mo contents in scheelites. This study highlights the use of texture and geochemistry of scheelites in skarn deposits, depicting the W mineralization processes.

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The trace element chemistry of quartz in carbonatite-related REE deposits: Implication for REE exploration

Zhang

Chen²,

Zhang³

et al. 2022

Ore Geology Reviews

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Taipingite-(Ce), (Ce73+, Ca2)Σ9Mg(SiO4)3[SiO3(OH)]4F3, a new mineral from the Taipingzhen REE deposit, North Qinling Orogen, central China

Cited by 5 publications

References 13 publications

Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals

Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals

Texture and Geochemistry of Scheelites in the Tongshankou Deposit in Daye, Hubei, China: Implication for REE Substitution Mechanism and Multistage W Mineralization Processes

The trace element chemistry of quartz in carbonatite-related REE deposits: Implication for REE exploration

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Taipingite-(Ce), (Ce73+, Ca2)Σ9Mg(SiO4)3[SiO3(OH)]4F3, a new mineral from the Taipingzhen REE deposit, North Qinling Orogen, central China

Cited by 5 publications

References 13 publications

Aluminotaipingite-(CeCa), (Ce6Ca3)Al(SiO4)3[SiO3(OH)]4F3, a new member of the cerite-supergroup minerals

Aluminotaipingite-(CeCa), (Ce6Ca3)Al(SiO4)3[SiO3(OH)]4F3, a new member of the cerite-supergroup minerals

Texture and Geochemistry of Scheelites in the Tongshankou Deposit in Daye, Hubei, China: Implication for REE Substitution Mechanism and Multistage W Mineralization Processes

The trace element chemistry of quartz in carbonatite-related REE deposits: Implication for REE exploration

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Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals

Aluminotaipingite-(CeCa), (Ce₆Ca₃)Al(SiO₄)₃[SiO₃(OH)]₄F_3, a new member of the cerite-supergroup minerals