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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Unique IdentifiersHide

Mindat ID:

43599

Long-form identifier:

mindat:1:1:43599:2

GUID
(UUID V4):

7599bba1-6fa3-4907-b75a-09c0828beda9

IMA Classification of MajindeiteHide

IMA status:

Approved

First published:

2016

Type description reference:

Ma, Chi, Beckett, John R. (2016) Majindeite, Mg₂Mo₃O₈, a new mineral from the Allende meteorite and a witness to post-crystallization oxidation of a Ca-Al-rich refractory inclusion. American Mineralogist, 101 (5) 1161-1170 doi:10.2138/am-2016-5399

Classification of MajindeiteHide

Strunz-mindat (2024):

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

Dana 8th ed.:

7.6.3.3

7 : MULTIPLE OXIDES
6 : (AB)₅X₈

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Mjd	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MajindeiteHide

Density:

5.54 g/cm³ (Calculated)

Chemistry of MajindeiteHide

Mindat Formula:

Mg₂Mo₃O₈

Elements listed:

Mg, Mo, O - search for minerals with similar chemistry

Common Impurities:

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 Å³

Comment:

nolanite-type structure

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
4.952 Å	(100)
3.520 Å	(57)
2.495 Å	(35)
2.426 Å	(67)
2.233 Å	(23)
1.994 Å	(50)
1.641 Å	(24)
1.553 Å	(38)

Comments:

From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 2: Planetesimal differentiation and alteration	4.566-4.550
6 : Secondary asteroid phases	4.566-4.560

Type Occurrence of MajindeiteHide

Type Locality:

ⓘ Allende meteorite, Pueblito de Allende, Chihuahua, Mexico

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:

Unnamed (Nb Oxide)

Spinel

Apatite

Reference:

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.

Synonyms of MajindeiteHide

IMA2012-079

Relationship of Majindeite to other SpeciesHide

Member of:

Kamiokite Group

Other Members of this group:

Iseite	Mn₂Mo₃O₈	Hex. 6mm : P6₃mc
Kamiokite	Fe₂Mo₃O₈	Hex. 6mm : P6₃mc

Related Minerals - Strunz-mindat Grouping Hide

4.CB.	Ferrohögbomite-2N2S	[(Fe²⁺,Mg,Zn,Al)₃(Al,Ti,Fe³⁺)₈O₁₅(OH)]₂	Hex. 6mm : P6₃mc
4.CB.	Magnesiohögbomite-6N12S	Mg₅Al₁₁TiO₂₃(OH)	Trig. 3m (3 2/m) : R3m
4.CB.	Zhenruite	(MoO₃)₂ · H₂O	Mon. 2/m : P2₁/m
4.CB.	Pengite	(Pb₈Sb³⁺₃)_Σ11Sb⁵⁺₉O₃₅	Trig. 3m (3 2/m) : R3m
4.CB.	Virgilluethite	MoO₃ · H₂O	Mon. 2/m : P2₁/b
4.CB.05	Brizziite	NaSb⁵⁺O₃	Trig. 3 : R3
4.CB.05	Corundum	Al₂O₃	Trig. 3m (3 2/m) : R3c
4.CB.05	Ecandrewsite	(Zn,Fe²⁺,Mn²⁺)TiO₃	Trig. 3 : R3
4.CB.05	Eskolaite	Cr₂O₃	Trig. 3m (3 2/m) : R3c
4.CB.05	Geikielite	MgTiO₃	Trig. 3 : R3
4.CB.05	Hematite	Fe₂O₃	Trig. 3m (3 2/m) : R3c
4.CB.05	Ilmenite	Fe²⁺TiO₃	Trig. 3 : R3
4.CB.05	Karelianite	V³⁺₂O₃	Trig. 3m (3 2/m) : R3c
4.CB.05	Melanostibite	Mn²⁺₂Fe³⁺Sb⁵⁺O₆	Trig. 3 : R3
4.CB.05	Pyrophanite	Mn²⁺TiO₃	Trig. 3 : R3
4.CB.05	Akimotoite	(Mg,Fe²⁺)SiO₃	Trig. 3 : R3
4.CB.05	Auroantimonate	AuSbO₃
4.CB.05	UM1998-11-O-AuHSb	Au⁺₂Sb³⁺O₂(OH)
4.CB.05	Tistarite	Ti³⁺₂O₃	Trig. 3m (3 2/m) : R3c
4.CB.05	Unnamed (Fe-Cr Oxide)	FeCrO₃	Trig. 3 : R3
4.CB.05	Hemleyite	(Fe²⁺_0.48Mg_0.37Ca_0.04Na_0.04Mn²⁺_0.03Al_0.03Cr³⁺_0.01)_sum=1.00Si_1.00O₃	Trig. 3 : R3
4.CB.10	Avicennite	Tl₂O₃	Iso. m3 (2/m 3) : Ia3
4.CB.10	Bixbyite-(Mn)	Mn³⁺₂O₃	Iso. m3 (2/m 3) : Ia3
4.CB.10	Bixbyite-(Fe)	(Fe,Mn)₂O₃	Iso.
4.CB.15	Armalcolite	(Mg,Fe²⁺)Ti₂O₅	Orth. mmm (2/m 2/m 2/m)
4.CB.15	Sassite	Ti³⁺₂Ti⁴⁺O₅	Orth. mmm (2/m 2/m 2/m) : Cmcm
4.CB.15	Pseudobrookite	Fe₂TiO₅	Orth. mmm (2/m 2/m 2/m)
4.CB.15	Ferropseudobrookite	Fe²⁺Ti₂O₅	Orth. mmm (2/m 2/m 2/m) : Cmcm
4.CB.15	Griffinite	Al₂TiO₅	Orth. mmm (2/m 2/m 2/m) : Cmcm
4.CB.15	Pseudobrookite Group
4.CB.20	Zincohögbomite-2N2S	[(Zn,Al,Fe²⁺)₃(Al,Fe³⁺,Ti)₈O₁₅(OH)]₂	Hex. 6mm : P6₃mc
4.CB.20	Zincohögbomite-2N6S	[(Zn,Mg)₇(Al,Fe³⁺,Ti)₁₆O₃₁(OH)]₂	Hex. 6mm : P6₃mc
4.CB.20	Magnesiohögbomite-6N6S	[(Mg,Fe²⁺)₃(Al,Ti,Fe³⁺)₈O₁₅(OH)]₆	Trig. 3m (3 2/m) : R3m
4.CB.20	Magnesiohögbomite-2N3S	[(Mg,Fe²⁺,Zn)₄(Al,Ti,Fe³⁺)₁₀O₁₉(OH)]₂	Trig. 3m (3 2/m) : P3 1m
4.CB.20	Magnesiohögbomite-2N2S	[(Mg,Fe²⁺)₃[Al₇(Ti,Fe³⁺)]O₁₅(OH)]₂	Hex. 6mm : P6₃mc
4.CB.20	Ferrohögbomite-6N12S	[(Fe²⁺,Mg,Zn)₅(Al,Ti,Fe³⁺)₁₂O₂₃(OH)]₆	Trig. 3m (3 2/m) : R3m
4.CB.20	Magnesiohögbomite-2N4S	(Mg_8.43Fe²⁺_1.57)_sum=10Al₂₂Ti⁴⁺₂O₄₆(OH)₂	Hex. 6mm : P6₃mc
4.CB.20	Magnesiobeltrandoite-2N3S	(Mg₆Al₂)(Al₁₈Fe³⁺₂)O₃₈(OH)₂	Trig. 3m : P3m1
4.CB.20	Zincovelesite-6N6S	Zn₃(Fe³⁺,Mn³⁺,Al,Ti)₈O₁₅(OH)	Trig. 3m (3 2/m) : P3m1
4.CB.25	Pseudorutile	Fe₂Ti₃O₉	Hex. 6 2 2 : P6₃ 2 2
4.CB.25	Kleberite	FeTi₆O₁₁(OH)₅	Mon. 2/m : P2₁/b
4.CB.30	Berdesinskiite	V³⁺₂TiO₅	Mon.
4.CB.30	Oxyvanite	V³⁺₂V⁴⁺O₅	Mon. 2/m : B2/b
4.CB.30	Kaitianite	Ti³⁺₂Ti⁴⁺O₅	Mon. 2/m : B2/b
4.CB.35	Olkhonskite	(Cr,V)₂Ti₃O₉	Mon.
4.CB.35	Schreyerite	V³⁺₂Ti₃O₉	Mon. 2/m : B2/b
4.CB.35	Machiite	Al₂Ti₃O₉	Mon. 2/m : B2/b
4.CB.35	Vestaite	(Ti⁴⁺Fe²⁺)Ti⁴⁺₃O₉	Mon. 2/m : B2/b
4.CB.40	Kamiokite	Fe₂Mo₃O₈	Hex. 6mm : P6₃mc
4.CB.40	Nolanite	V³⁺₈Fe³⁺₂O₁₄(OH)₂	Hex. 6mm : P6₃mc
4.CB.40	Rinmanite	Zn₂Sb₂Mg₂Fe₄O₁₄(OH)₂	Hex. 6 : P6₃
4.CB.40	Iseite	Mn₂Mo₃O₈	Hex. 6mm : P6₃mc
4.CB.45	Claudetite	As₂O₃	Mon. 2/m
4.CB.45	Stibioclaudetite	AsSbO₃	Mon. 2/m : P2₁/m
4.CB.50	Arsenolite	As₂O₃	Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.50	Senarmontite	Sb₂O₃	Iso. m3m (4/m 3 2/m) : Fd3m
4.CB.55	Valentinite	Sb₂O₃	Orth. mmm (2/m 2/m 2/m) : Pccn
4.CB.60	Bismite	Bi₂O₃	Mon. 2/m : P2₁/b
4.CB.65	Sphaerobismoite	Bi₂O₃	Tet.
4.CB.70	Sillénite	Bi₁₂SiO₂₀	Iso. 2 3 : I2 3
4.CB.75	Kyzylkumite	V³⁺Ti₂O₅(OH)	Mon. 2/m : P2₁/b
4.CB.80	Tietaiyangite	Fe³⁺₄Fe²⁺TiO₉	Hex.
4.CB.85	Liuite	FeTiO₃	Orth. mmm (2/m 2/m 2/m) : Pnma
4.CB.90	Luogufengite	Fe₂O₃	Orth. mm2 : Pna2₁
4.CB.95	Wangdaodeite	FeTiO₃	Trig. 3m : R3c

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.

Internet Links for MajindeiteHide

mindat.org URL:

https://www.mindat.org/min-43599.html
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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for MajindeiteHide

Reference List:

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.

Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2013) IMA Commission on New Minerals, Nomenclature and Classification. CNMNC Newsletter No. 15. Mineralogical Magazine, 77 (1) 1-12 doi:10.1180/minmag.2013.077.1.01

(2023) Majindeite. Handbook of Mineralogy. Mineralogical Society of America

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Mexico (TL)

Chihuahua

Pueblito de Allende

ⓘ Allende meteorite (TL)

Williams et al. (2013) +1 other reference

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Majindeite