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Marokite

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Administrative map of Morocco (2015)

Morocco
Formula:
CaMn3+2O4
Colour:
Black
Lustre:
Adamantine
Hardness:
Specific Gravity:
4.64
Crystal System:
Orthorhombic
Name:
For the first occurrence in Morocco, Maroc in French.
This page provides mineralogical data about Marokite.


Hide all sections | Show all sections

Classification of MarokiteHide

Approved
First Published:
1963
4.BC.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
C : With medium-sized and large cations
7.2.10.1

7 : MULTIPLE OXIDES
2 : AB2X4
7.4.15

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths

Physical Properties of MarokiteHide

Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Reddish brown
Hardness:
6½ on Mohs scale
Hardness:
VHN100=800 - Vickers
Cleavage:
Perfect
{100} Perfect, {001} Good
Density:
4.64 g/cm3 (Measured)    4.63 g/cm3 (Calculated)

Optical Data of MarokiteHide

Type:
Anisotropic
Anisotropism:
Strong
Reflectivity:
400nmR=20.2–22.9%
420nmR=19.3–21.9%
440nmR=18.4–20.9%
460nmR=17.7–20.0%
480nmR=17.0–19.3%
500nmR=16.5–18.7%
520nmR=16.2–18.3%
540nmR=16.0–18.2%
560nmR=16.0–18.4%
580nmR=16.0–18.7%
600nmR=15.9–18.6%
620nmR=15.7–18.3%
640nmR=15.5–18.0%
660nmR=15.4–17.8%
680nmR=15.2–17.5%
700nmR=15.1–17.3%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 20.2–22.9%.
Colour in reflected light:
Gray to brown
Internal Reflections:
Dark red, carmine red
Pleochroism:
Strong
Comments:
X = c = safflower-red; Y and Z = opaque (very dark red in very thin sections)

Chemical Properties of MarokiteHide

Formula:
CaMn3+2O4

Crystallography of MarokiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 9.71 Å, b = 10.03 Å, c = 3.16 Å
Ratio:
a:b:c = 0.968 : 1 : 0.315
Unit Cell V:
307.76 ų (Calculated from Unit Cell)
Morphology:
Prismatic, flattened on {010}, with {120}, {110}, {201}, and {011}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.71 (vs)
2.22 (vs)
2.29 (s)
2.07 (s)
2.87 (m)
2.56 (m)
1.63 (m)

Type Occurrence of MarokiteHide

General Appearance of Type Material:
Prismatic crystals to 5 cm.
Place of Conservation of Type Material:
Geological Survey, Rabat, Morocco.
National School of Mines, Paris, France.
Geological Setting of Type Material:
Manganese deposit

Synonyms of MarokiteHide

Other Language Names for MarokiteHide

German:Marokit
Spanish:Marokita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Henritermierite2 photos of Marokite associated with Henritermierite on mindat.org.
Jouravskite2 photos of Marokite associated with Jouravskite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.BC.AddibischoffiteCa2Al6Al6O20Tric. 1 : P1
4.BC.10DmitryivanoviteCaAl2O4Mon. 2/m : P21/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.4.1BromelliteBeOHex. 6mm : P63mc
7.4.2BehoiteBe(OH)2Orth. 2 2 2 : P21 21 21
7.4.3ClinobehoiteBe(OH)2Mon. 2 : P21
7.4.4ChrysoberylBeAl2O4Orth. mmm (2/m 2/m 2/m)
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16Hex. 6/mmm (6/m 2/m 2/m)
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12Trig.
7.4.7PericlaseMgOIso. m3m (4/m 3 2/m) : Fm3m
7.4.8BruciteMg(OH)2Trig. 3m (3 2/m) : P3m1
7.4.9SpinelMgAl2O4Iso. m3m (4/m 3 2/m) : Fd3m
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
7.4.11LimeCaOIso. m3m (4/m 3 2/m)
7.4.12PortlanditeCa(OH)2Trig. 3m (3 2/m)
7.4.13ChlormayeniteCa12Al14O32[◻4Cl2]Iso. 4 3m : I4 3d
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
7.4.16Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
7.4.17HollanditeBa(Mn4+6Mn3+2)O16Mon. 2/m
7.4.18Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10Mon. 2/m
7.4.19Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2OMon. 2/m : P2/m

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 MarokiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ribaud, P.V., Muan, A. (1963) Melting relations of Ca-O-manganese oxide and MgO-manganese oxide mixtures in air. Journal of the American Ceramic Society: 46: 33-36. (synthetic)
Gaudefroy, C., Jouravsky, G., Permingeat, F. (1963) La marokite, CaMn2O4 une nouvelle éspèce minérale. Bulletin de la Société française de Minéralogie et de Cristallographie: 86: 359-67. (in French)
Fleischer, M. (1964) New mineral names. American Mineralogist: 49: 816-821.
Couffon, M.M., Rocher, G., Protas, J. (1964) Determination de la structure de la marokite. Compt. Rend.: 258: 1847-1849. (in French).
Lepicard, G., Protas, J. (1966) Étude structurale de l'oxyde double de manganèse et de calcium orthorhombique CaMn2O4 (marokite). Bulletin de la Société Française de Minéralogie et de Cristallographie: 89: 318-324.
de Villiers, P.R., Herbstein, F.H. (1968) Second occurrence of marokite. American Mineralogist: 53: 495-496.
Ling, C.D., Neumeier, J.J., Argyriou, D.N. (2001) Observation of antiferromagnetism in marokite CaMn2O4. Journal of Solid State Chemistry: 160: 167-173.
Zouari, S., Ranno, L., Cheikh-Rouhou, A., Isnard, O., Pernet, M., Wolfers, P., Strobel, P. (2003) New model for the magnetic structure of the marokite-type oxide CaMn2O4. Journal of Alloys and Compounds: 353: 5-11.
Yamanaka, T., Uchida, A., Nakamoto, Y. (2008) Structural transition of post-spinel phases CaMn2O4, CaFe2O4, and CaTi2O4 under high pressures up to 80 GPa. American Mineralogist: 93: 1874-1881.

Internet Links for MarokiteHide

Localities for MarokiteHide

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.
Germany
 
  • Rhineland-Palatinate
    • Eifel
      • Mayen
        • Ettringen
          • Bellerberg volcano
Schäfer, Ch. (2016): Einige bemerkenswerte Funde vom Bellerberg-Vulkan bei Mayen, Der Aufschluß, Vol. 67 (1) , pp. 5-15
India
 
  • Odisha (Orissa)
    • Cuttack District
Mallick, B., Rautray, T. R., Nayak, P. K., Vijayan, V., Singh, P., Behera, R. C., ... & Choudhury, R. K. (2005, March). Characterisation of hot material erupted from Mahanadi riverbank using EDXRF and XRD techniques. In INDIAN JOURNAL OF PHYSICS AND PROCEEDINGS OF THE INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE-NEW SERIES- (Vol. 79, No. 3, p. 293). NOT KNOWN.
Morocco (TL)
 
  • Drâa-Tafilalet Region
    • Ouarzazate Province
Gaudefroy, C., Jouravsky, G., Permingeat, F. (1963) La marokite, CaMn2O4 une nouvelle éspèce minérale. Bulletin de la Société française de Minéralogie et de Cristallographie: 86: 359-67.
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Ilmen Mts
          • Ilmen Natural Reserve
Palchik, N. A., Moroz, T. N., Grigorieva, T. N., & Miroshnichenko, L. V. (2014). Manganese minerals from the Miassovo freshwater lake: Composition and structure. Russian Journal of Inorganic Chemistry, 59(5), 511-518.
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Black Rock
de Villiers, P.R., Herbstein, F.H. (1968) Second occurrence of marokite. American Mineralogist: 53: 495.
      • Hotazel
Von Bezing, K. L. et al. (1991) The Kalahari manganese field: An Update, Mineralogical Record 22(4) 279-302;; Beukes, N. J., Burger, A. M., & Gutzmer, J. (1995). Fault-controlled hydrothermal alteration of Palaeoproterozoic manganese ore in Wessels Mine, Kalahari manganese field. South African Journal of Geology, 98(4), 430-451.
      • Kuruman
        • N'Chwaning Mines
Minerals of South Africa
USA
 
  • Nevada
    • Mineral Co.
      • Candelaria District
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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