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Marokite

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Administrative map of Morocco (2015)

Morocco
Formula:
CaMn23+O4
System:
Orthorhombic
Colour:
Black
Lustre:
Adamantine
Hardness:
Name:
For the first occurrence in Morocco, Maroc in French.
This page provides mineralogical data about Marokite.


Classification of Marokite

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 Marokite

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

Optical Data of Marokite

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 Marokite

Formula:
CaMn23+O4
Elements listed in formula:

Crystallography of Marokite

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 Volume:
V 307.76 ų (Calculated from Unit Cell)
Morphology:
Prismatic, flattened on {010}, with {120}, {110}, {201}, and {011}.
X-Ray 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 Marokite

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

Relationship of Marokite to other Species

7.4.1BromelliteBeO
7.4.2BehoiteBe(OH)2
7.4.3ClinobehoiteBe(OH)2
7.4.4ChrysoberylBeAl2O4
7.4.5Magnesiotaaffeite-2N’2SMg3Al8BeO16
7.4.6Magnesiotaaffeite-6N’3SMg2BeAl6O12
7.4.7PericlaseMgO
7.4.8BruciteMg(OH)2
7.4.9SpinelMgAl2O4
7.4.10MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
7.4.11LimeCaO
7.4.12PortlanditeCa(OH)2
7.4.13ChlormayeniteCa12Al14O32[◻4Cl2]
7.4.14HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
7.4.16Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
7.4.17HollanditeBa(Mn64+Mn23+)O16
7.4.18Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
7.4.19Todorokite(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12 · 3-4H2O

Other Names for Marokite

Name in Other Languages:
German:Marokit
Spanish:Marokita

Other Information

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 Marokite

Reference List:
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 Marokite

mindat.org URL:
https://www.mindat.org/min-2578.html
Please feel free to link to this page.

Localities for Marokite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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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