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Oxynatromicrolite

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Formula:
(Na,Ca,U)2(Ta,Nb)2O6(O,F)
Specific Gravity:
6.580
Crystal System:
Isometric
Name:
Named according to the recommended pyrochlore supergroup nomenclature (Atencio et al. 2010), indicating dominant elements and its relation to other microlite group minerals.
Chemically comparable to irtyshite and natrotantite. Strongly metamict.

Associated minerals include a hydrated derivative of oxynatromicrolite and a red tourmaline-group species.


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Classification of OxynatromicroliteHide

Approved
Approval Year:
2013
First Published:
2017

Pronounciation of OxynatromicroliteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of OxynatromicroliteHide

Density:
6.580(4) g/cm3 (Measured)    6.506 g/cm3 (Calculated)
Comment:
values for unheated material

Optical Data of OxynatromicroliteHide

Type:
Isotropic
RI values:
n = 1.999(5)
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Very High
Reflectivity:
470nmR=11.88%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 11.88%.

Chemical Properties of OxynatromicroliteHide

Formula:
(Na,Ca,U)2(Ta,Nb)2O6(O,F)
Common Impurities:
Ca,U,Nb,H2O,F

Crystallography of OxynatromicroliteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Setting:
Fd3m
Cell Parameters:
a = 10.420(6) Å
Unit Cell V:
1131.4 ų
Morphology:
Euhedral octahedral crystals
Comment:
data for material recrystallized during 4-hour heating at 1000oC in nitrogen atmosphere; unit cell parameter similar to that of the other supergroup members

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.149(40)
3.026(100)
2.617(25)
2.009(10)
1.844(35)
1.571(30)
1.503(10)
1.196(15)
Comments:
From Type Description.

Type Occurrence of OxynatromicroliteHide

General Appearance of Type Material:
Strongly metamict, usually euhedral octahedra, up to 0.05-0.20 mm
Place of Conservation of Type Material:
Type material is deposited in the collections of the Geological Museum of China, Beijing, China, specimen number M11940
Geological Setting of Type Material:
Late-stage in a rare-metal granitic pegmatite
Associated Minerals at Type Locality:
Reference:
Fan, G., Ge, X., Li, G., Yu, A., Shen, G. (2016): 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

Synonyms of OxynatromicroliteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for OxynatromicroliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Fan Guang, Ge Xiangkun, Li Guowu, Yu Apeng and Shen Ganfu (2013) Oxynatromicrolite, IMA 2013-063. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine: 77: 2997-3005.
Fan, G., Ge, X., Li, G., Yu, A., Shen, G. (2016) 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

Internet Links for OxynatromicroliteHide

Localities for OxynatromicroliteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
China (TL)
 
  • Henan Province
    • Sanmenxia Prefecture
      • Lushi Co.
        • Guanpo
          • Guanpo pegmatite field
Fan Guang, Ge Xiangkun, Li Guowu, Yu Apeng and Shen Ganfu (2013) Oxynatromicrolite, IMA 2013-063. CNMNC Newsletter No. 17, October 2013, page 3004; Mineralogical Magazine, 77, 2997-3005; Fan, G., Ge, X., Li, G., Yu, A., Shen, G. (2016): 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
Mineral and/or Locality  
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