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Guang, Fan, Xiangkun, Ge, Guowu, Li, Apeng, Yu, Ganfu, Shen (2017) Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China. Mineralogical Magazine, 81 (4) 743-751 doi:10.1180/minmag.2016.080.121

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Reference TypeJournal (article/letter/editorial)
TitleOxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China
JournalMineralogical Magazine
AuthorsGuang, FanAuthor
Xiangkun, GeAuthor
Guowu, LiAuthor
Apeng, YuAuthor
Ganfu, ShenAuthor
Year2017 (August)Volume81
Issue4
PublisherMineralogical Society
DOIdoi:10.1180/minmag.2016.080.121Search in ResearchGate
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Mindat Ref. ID244914Long-form Identifiermindat:1:5:244914:6
GUID0
Full ReferenceGuang, Fan, Xiangkun, Ge, Guowu, Li, Apeng, Yu, Ganfu, Shen (2017) Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China. Mineralogical Magazine, 81 (4) 743-751 doi:10.1180/minmag.2016.080.121
Plain TextGuang, Fan, Xiangkun, Ge, Guowu, Li, Apeng, Yu, Ganfu, Shen (2017) Oxynatromicrolite, (Na,Ca,U)2Ta2O6(O,F), a new member of the pyrochlore supergroup from Guanpo, Henan Province, China. Mineralogical Magazine, 81 (4) 743-751 doi:10.1180/minmag.2016.080.121
Abstract/NotesAbstractA new mineral species of the pyrochlore supergroup, oxynatromicrolite
(IMA2013-063), (Na,Ca,U)2Ta2O6O, was found
in the No. 309 rare-metal granitic pegmatite vein, Guanpo, Lushi county,
Henan Province, China, which is characterized by tantalum at theB site and
oxygen at the Y site and is Na dominant at the A site. The mineral occurs as
strongly metamict, and mostly euhedral octahedral crystals up to 0.05–0.20
mm across. The measured density of an unheated sample is 6.580(4) g
cm–3, and the calculatedone is 6.506 g cm–3.
Optically, the mineral is isotropic, with an index of refraction 1.999(5)
and a reflectance of 11.88% (470 nm). When heated to 1000°C for 4 hours in
N2, the mineral recrystallizes in the cubic system, with space
group Fd3mand with unit-cell parameters
similar those of other pyrochlore supergroup species: a =
10.420(6) Å, V = 1131.4(2) Å3. Electron
microprobe analyses revealed the following composition of the mineral (in
wt.%): Na2O 5.41, CaO 4.56, UO214.60,
La2O3 0.16, Ce2O3 0.11,
Nd2O3 0.13, PbO 0.62, Ta2O5
61.52, Nb2O5 8.21, Sb2O5 0.23,
TiO2 0.05, SiO2 0.56, SnO2 0.29, F1.04,
H2O 1.50 (calculated to correspond to 0.47 H2O pfu), F≡O
–0.44, sum = 98.53%, which corresponds to the empirical formula
(Na0.99Ca0.46U0.31Pb0.02La0.01H2O0.21)∑2.00(Ta1.58Nb0.35Si0.05Sn0.01Sb0.01)∑2.00O6
(O0.43F0.31H2O0.26)∑1.00,
represented by the simplified formula
(Na,Ca,U)2(Ta,Nb)2O6(O,F).Oxynatromicrolite
crystallized during the late-stage of formation for the No. 309 pegmatite
dyke and is associated with quartz, albite, potassium feldspar, muscovite,
kaolinite, tantalite-Mn, stibiotantalite, pollucite, spodumene,
montebrasite, Hf-rich zircon, a red tourmaline,
polylithionite,trilithionite, luanshiweiite-2M1 (IMA2011-102) and a hydrated derivative of
oxynatromicrolite.

Map of Localities

Locality Pages

LocalityCitation Details
Pegmatite vein no. 309, Guanpo pegmatite field, Guanpo, Lushi County, Sanmenxia, Henan, China

Mineral Pages

MineralCitation Details
Oxynatromicrolite

Mineral Occurrences

LocalityMineral(s)
Pegmatite vein no. 309, Guanpo pegmatite field, Guanpo, Lushi County, Sanmenxia, Henan, Chinaⓘ Oxynatromicrolite

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Ge, Xiangkun, Fan, Guang, Li, Guowu, Shen, Ganfu, Chen, Zhangru, Ai, Yujie (2017) Mianningite, ([], Pb, Ce, Na) (U4+, Mn, U6+) Fe3+ 2(Ti, Fe3+)18 O38, a new member of the crichtonite group from Maoniuping REE deposit, Mianning county, southwest Sichuan, China. European Journal of Mineralogy, 29 (2) 331-338 doi:10.1127/ejm/2017/0029-2600
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