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Majindeite

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Formula:
Mg2Mo3O8
Specific Gravity:
5.54 (Calculated)
Crystal System:
Hexagonal
Member of:
Name:
For Ma Jinge (1939-1991) a mineralogist at the China University of Geologsciences (Wuhan).
Mg analogue of kamiokite. The associated phases include Ni-Fe and Ru-Os-Ir alloys.

Majindeite likely results from subsolidus oxidation of Mo-rich precursor phase(s), possibly directly from kamiokite. Oxygen and magnesium (and Ca) were derived externally via cracks etc. within spinel. Majindeite formation is associated with an oxidation event synchronic with or taking place after the formation of grossular-bearing veins cutting melilite.


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Classification of MajindeiteHide

Approved
4.CB.40

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
7.6.3.3

7 : MULTIPLE OXIDES
6 : (AB)5X8

Physical Properties of MajindeiteHide

Density:
5.54 g/cm3 (Calculated)

Chemical Properties of MajindeiteHide

Formula:
Mg2Mo3O8
Common Impurities:
Fe

Crystallography of MajindeiteHide

Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.778 Å, b = 5.778 Å, c = 9.904 Å
Ratio:
a:b:c = 1 : 1 : 1.714
Unit Cell V:
286.35 ų
Z:
2
Comment:
nolanite-type structure

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.952(100)
3.520(57)
2.495(35)
2.426(67)
2.233(23)
1.994(50)
1.641(24)
1.553(38)
Comments:
From Type Description.

Type Occurrence of MajindeiteHide

General Appearance of Type Material:
submicrometer-sized crystals
Place of Conservation of Type Material:
Smithsonian Institution’s National Museum of Natural History, Washington DC, USA, registration number USNM 7615
Geological Setting of Type Material:
Ca-Al inclusion (CAI) within the Allende meteorite
Associated Minerals at Type Locality:

Synonyms of MajindeiteHide

Other Language Names for MajindeiteHide

Relationship of Majindeite to other SpeciesHide

Member of:
Other Members of this group:
IseiteMn2Mo3O8Hex. 6mm : P63mc
KamiokiteFe2Mo3O8Hex.

Related Minerals - Nickel-Strunz GroupingHide

4.CB.05BrizziiteNaSb5+O3Trig. 3 : R3
4.CB.05CorundumAl2O3Trig. 3m (3 2/m) : R3c
4.CB.05Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
4.CB.05EskolaiteCr2O3Trig.
4.CB.05GeikieliteMgTiO3Trig. 3 : R3
4.CB.05HematiteFe2O3Trig. 3m (3 2/m) : R3c
4.CB.05IlmeniteFe2+TiO3Trig. 3 : R3
4.CB.05KarelianiteV3+2O3Trig.
4.CB.05MelanostibiteMn2+(Sb5+,Fe3+)O3Trig.
4.CB.05PyrophaniteMn2+TiO3Trig. 3 : R3
4.CB.05Akimotoite(Mg,Fe2+)SiO3Trig.
4.CB.05AuroantimonateAuSbO3
4.CB.05UM1998-11-O-AuHSbAu+2Sb3+O2(OH)
4.CB.05TistariteTi3+2O3Trig. 3m (3 2/m) : R3c
4.CB.10AvicenniteTl2O3Iso. m3 (2/m 3) : Ia3
4.CB.10BixbyiteMn3+2O3Iso. m3 (2/m 3) : Ia3
4.CB.15Armalcolite(Mg,Fe2+)Ti2O5Orth. mmm (2/m 2/m 2/m)
4.CB.15PseudobrookiteFe2TiO5Orth. mmm (2/m 2/m 2/m)
4.CB.20Zincohögbomite-2N2S[(Zn,Al,Fe2+)3(Al,Fe3+,Ti)8O15(OH)]2Hex. 6mm : P63mc
4.CB.20Zincohögbomite-2N6S[(Zn,Mg)7(Al,Fe3+,Ti)16O31(OH)]2Hex. 6mm : P63mc
4.CB.20Magnesiohögbomite-6N6S[(Mg,Fe2+)3(Al,Ti,Fe3+)8O15(OH)]6Trig. 3m (3 2/m) : R3m
4.CB.20Magnesiohögbomite-2N3S[(Mg,Fe2+,Zn)4(Al,Ti,Fe3+)10O19(OH)]2Trig. 3m (3 2/m) : P3 1m
4.CB.20Magnesiohögbomite-2N2S[(Mg,Fe2+)3[Al7(Ti,Fe3+)]O15(OH)]2Hex. 6mm : P63mc
4.CB.20Ferrohögbomite-6N12S[(Fe2+,Mg,Zn)5(Al,Ti,Fe3+)12O23(OH)]6Trig. 3m (3 2/m) : R3m
4.CB.25PseudorutileFe2Ti3O9Hex.
4.CB.25KleberiteFeTi6O11(OH)5Mon. 2/m : P21/b
4.CB.30BerdesinskiiteV3+2TiO5Mon.
4.CB.30OxyvaniteV3+2V4+O5Mon. 2/m : B2/b
4.CB.35Olkhonskite(Cr,V)2Ti3O9Mon.
4.CB.35SchreyeriteV3+2Ti3O9Mon.
4.CB.40KamiokiteFe2Mo3O8Hex.
4.CB.40Nolanite(V3+,Fe3+,Fe2+,Ti)10O14(OH)2Hex.
4.CB.40RinmaniteZn2Sb2Mg2Fe4O14(OH)2Hex. 6 : P63
4.CB.40IseiteMn2Mo3O8Hex. 6mm : P63mc
4.CB.45ClaudetiteAs2O3Mon. 2/m
4.CB.45StibioclaudetiteAsSbO3Mon. 2/m : P21/m
4.CB.50ArsenoliteAs2O3Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.50SenarmontiteSb2O3Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.55ValentiniteSb2O3Orth. mmm (2/m 2/m 2/m) : Pccn
4.CB.60BismiteBi2O3Mon. 2/m : P21/b
4.CB.65SphaerobismoiteBi2O3Tet.
4.CB.70SilléniteBi12SiO20Iso. 2 3 : I2 3
4.CB.75KyzylkumiteV3+Ti2O5(OH)Mon. 2/m : P21/b
4.CB.80TietaiyangiteFe3+4Fe2+TiO9Hex.

Related Minerals - Dana Grouping (8th Ed.)Hide

7.6.3.1KamiokiteFe2Mo3O8Hex.
7.6.3.2IseiteMn2Mo3O8Hex. 6mm : P63mc

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 MajindeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ma, C., Beckett, J.R. and Rossman, G.R. (2009): Discovery of a Mg-dominant analogue of kamiokite, Mg2Mo3O8, a new mineral from an Allende type B1 CAI. Meteoritics and Planetary Science, 44, A128.
Ma, C. (2013) Majindeite, IMA 2012-079. CNMNC Newsletter No. 15, February 2013, page 10; Mineralogical Magazine, 77, 1-12.
Ma, C., Beckett, J.R. (2016): Majindeite, Mg2Mo3O8, a new mineral from the Allende meteorite and a witness to postcrystallization oxidation of a Ca-Al-rich refractory inclusion. American Mineralogist: 101: 1161-1170

Internet Links for MajindeiteHide

Localities for MajindeiteHide

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.
Mexico (TL)
 
  • Chihuahua
    • Pueblito de Allende
Ma, C. (2013) Majindeite, IMA 2012-079. CNMNC Newsletter No. 15, February 2013, page 10; Mineralogical Magazine, 77, 1-12
Mineral and/or Locality  
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