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Marokite
A valid IMA mineral species
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About Marokite
Formula:
CaMn3+2O4
Colour:
Black
Lustre:
Adamantine
Hardness:
6½
Specific Gravity:
4.64
Crystal System:
Orthorhombic
Member of:
Name:
For the first occurrence in Morocco, Maroc in French.
Unique Identifiers
Mindat ID:
2578
Long-form identifier:
mindat:1:1:2578:8
Similar Names
| Marosite (of Cook and Sherwood) | A rock subtype | |
| Marosite (of Iddings) | A rock subtype | |
| Myrickite | A variety of 'Chalcedony' [Quartz] | SiO2 |
IMA Classification of Marokite
Approved
Approval year:
1963
First published:
1963
Classification of Marokite
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
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 : MULTIPLE OXIDES
2 : AB2X4
7.4.15
7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Mro | 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 Marokite
Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Reddish brown
Hardness:
6½ on Mohs scale
Hardness:
VHN100=800 - Vickers
Cleavage:
Perfect
{100} Perfect, {001} Good
{100} Perfect, {001} Good
Density:
4.64 g/cm3 (Measured) 4.63 g/cm3 (Calculated)
Optical Data of Marokite
Type:
Biaxial (-)
Anisotropism:
Strong: yellowish green to greenish yellow
Bireflectance:
Yellowish gray to gray-brown
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 400nm | 20.2–22.9% |
| 420nm | 19.3–21.9% |
| 440nm | 18.4–20.9% |
| 460nm | 17.7–20.0% |
| 480nm | 17.0–19.3% |
| 500nm | 16.5–18.7% |
| 520nm | 16.2–18.3% |
| 540nm | 16.0–18.2% |
| 560nm | 16.0–18.4% |
| 580nm | 16.0–18.7% |
| 600nm | 15.9–18.6% |
| 620nm | 15.7–18.3% |
| 640nm | 15.5–18.0% |
| 660nm | 15.4–17.8% |
| 680nm | 15.2–17.5% |
| 700nm | 15.1–17.3% |
Graph shows reflectance levels at different wavelengths (in nm). 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)
Chemistry of Marokite
Mindat Formula:
CaMn3+2O4
Element Weights:
Elements listed:
Crystallography of Marokite
Crystal System:
Orthorhombic
Cell Parameters:
a = 9.71(2) Å, b = 10.03(2) Å, c = 3.162(5) Å
Ratio:
a:b:c = 0.968 : 1 : 0.315
Unit Cell V:
307.95 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic, flattened on {010}, with {120}, {110}, {201}, and {011}.
Comment:
Point Group: 2/m 2/m 2/m or mm2.; Space Group: Pmab or P21ab.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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CIF File Best | x | y | z | a | b | c
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0012830 | Marokite | 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 | 2003 | synthetic | 0 | 293 | |
| 0012829 | Marokite | 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 | 2003 | synthetic | 0 | 293 | |
| 0014006 | Marokite | Ling C D, Neumeier J J, Argyriou D N (2001) Observation of antiferromagnetism in marokite CaMn2O4 Journal of Solid State Chemistry 160 167-173 | 2001 | synthetic | 0 | 293 | |
| 0014005 | Marokite | Ling C D, Neumeier J J, Argyriou D N (2001) Observation of antiferromagnetism in marokite CaMn2O4 Journal of Solid State Chemistry 160 167-173 | 2001 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.71 Å | (vs) |
| 2.22 Å | (vs) |
| 2.29 Å | (s) |
| 2.07 Å | (s) |
| 2.87 Å | (m) |
| 2.56 Å | (m) |
| 1.63 Å | (m) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
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.
National School of Mines, Paris, France.
Geological Setting of Type Material:
Manganese deposit
Associated Minerals at Type Locality:
Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany