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Mianningite

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About MianningiteHide

Formula:
(◻,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2 (Ti,Fe3+)18O38
Colour:
Black
Lustre:
Sub-Metallic
Hardness:
6
Specific Gravity:
4.62
Crystal System:
Trigonal
Name:
Named after the county of its type locality, Mianning county, Sichuan province, China.
Mianningite can be considered as the analogue of mapiquiroite with the M0 site preferentially vacant.
Initially ◻-dominant mineral of davidite group without special name was described from Kazakhstan (Ryzhov e.a., 1983). Then a poorly characterized mineral of the same composition from Romania named Romanite was published without approval (Dragila, 1990).


Classification of MianningiteHide

Approved
Approval Year:
2014
First Published:
2017

Physical Properties of MianningiteHide

Sub-Metallic
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
Comment:
Its average micro-indentation hardness is 83.8 kg/mm2 (load 0.2 kg)
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
4.62(8) g/cm3 (Measured)    4.77 g/cm3 (Calculated)

Optical Data of MianningiteHide

Type:
Isotropic
Type:
Isotropic
Bireflectance:
Exhibits none bireflectance
Colour in reflected light:
Grayish white
Internal Reflections:
No internal reflections
Pleochroism:
Non-pleochroic

Chemical Properties of MianningiteHide

Formula:
(◻,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2 (Ti,Fe3+)18O38
IMA Formula:
(Fe2+,U,Pb)2(Ti,Fe3+)O12(?)

Crystallography of MianningiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 10.3462(5) Å, c = 20.837(2) Å
Ratio:
a:c = 1 : 2.014
Unit Cell V:
1931.65 ų
Z:
3
Morphology:
Subhedral to euhedral tabular crystals, up to 1–2 mm in size

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.065(75)
2.883(55)
2.627(100)
2.476(55)
2.254(70)
2.144(100)
1.704(55)
1.545(60)
Comments:
From Type Description.

Type Occurrence of MianningiteHide

General Appearance of Type Material:
Opaque subhedral to euhedral tabular crystals, up to 1–2 mm in size
Place of Conservation of Type Material:
Type material is deposited in the collections of the Geological Museum of China, Beijing, China, registration number M12189
Geological Setting of Type Material:
In fractures of lamprophyre veins and in the contact between lamprophyre and a later quartz–alkali feldspar syenite dyke with REE mineralization.
Associated Minerals at Type Locality:

Synonyms of MianningiteHide

Relationship of Mianningite to other SpeciesHide

Other Members of this group:
AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
Cleusonite(Pb,Sr)(U4+,U6+)(Fe2+,Zn)2(Ti,Fe2+,Fe3+)18(O,OH)38Trig. 3 : R3
CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38Trig. 3 : R3
Davidite-(Ce)(Ce,La)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig. 3 : R3
Davidite-(La)(La,Ce)(Y,U,Fe)(Ti,Fe)20(O,OH)38Trig.
Davidite-(Y)(La,Ce,Na,Ca,Pb)(Y,Fe2+,◻)(Fe2+,Mn2+)2(Ti,Fe3+,Nb,Zr)18O38 (hypothetical)Trig.
Dessauite-(Y)(Sr,Pb)(Y,U)(Ti,Fe3+)20O38Trig. 3 : R3
Gramaccioliite-(Y)(Pb,Sr)(Y,Mn)Fe3+2(Ti,Fe3+)18O38Trig. 3
LandauiteNaMnZn2(Ti,Fe)6Ti12O38Trig. 3 : R3
Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38Trig.
Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38Trig.
Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
Mathiasite(K, Ba, Sr)(Zr, Fe)(Mg,Fe)2 (Ti,Cr,Fe)18O38Trig.
PaseroitePbMn2+(Mn2+,Fe3+)2(V5+,Ti,◻)18O38 Trig. 3 : R3
SenaitePb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38Trig.
UM1987-03-O:FePbTiU~(U,Pb)(Ti,Fe3+,Fe2+,Mn)21O38Trig. 3 : R3
Unnamed (HBU UK-4)NaFe2+Zn2(Ti,Fe3+,Nb)6Ti12O38Trig. 3 : R3

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 MianningiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ryzhov B.I., Lyubomilova G.V., Viktorov V.V. (1983) The find of compositionaly unusual davidite in zone of layer oxidation Paleocenic sediments. Doklady Akademii Nauk SSSR: 269 (4): 924-928 (in Russian).
Dragila M. (1990) Observatli mineralogice asupra unul nou mineral din grupa daviditului. Revista Minelor: 41 (8): 414-418 (in Italian).
Ge, X., Fan, G., Li, G., Shen, G., Chen, Z. and Ai, Y. (2015) Mianningite, IMA 2014-072. CNMNC Newsletter No. 23, February 2015, page 54; Mineralogical Magazine, 79, 51-58
Ge X., Fan G., Li G., Shen G., Chen Z., Ai Y. (2017): Mianningite, (□,Pb,Ce,Na)(U4+,Mn,U6+)Fe3+2(Ti,Fe3+)18O38, a new member of the crichtonite group from Maoniuping REE deposit, Mianning county, northwest Sichuan, China. European Journal of Mineralogy: 29: 331-338.

Internet Links for MianningiteHide

Localities for MianningiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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)
 
  • Sichuan Province
    • Liangshan Autonomous Prefecture
      • Mianning Co.
Ge, X., Fan, G., Li, G., Shen, G., Chen, Z. and Ai, Y. (2015) Mianningite, IMA 2014-072. CNMNC Newsletter No. 23, February 2015, page 54; Mineralogical Magazine, 79, 51-58
Mongolia
 
  • Hovd Aimag (Khovd Aimag)
    • Altai Mts
Pavel M. Kartashov analytical data of 1996
Russia
 
  • Far-Eastern Region
    • Amurskaya Oblast'
      • Dambuki ore cluster
L.B. Larichev, V.A. Oznobikhin & E.V. Petrosyan data
L.I. Larichev, V.A. Oznobikhin & E.V. Petrosyan data
L.B. Larichev, V.A. Oznobikhin & E.V. Petrosyan data; Anatoly Kasatkin analytical data 2016
Mineral and/or Locality  
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