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Marokite Mineral Data
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General Marokite Information
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 Chemical Formula: |
CaMn+++2O4 |
| Composition: |
Molecular Weight = 213.95 gm |
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Calcium 18.73 % Ca 26.21 % CaO |
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Manganese 51.36 % Mn 73.79 % Mn2O3 |
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Oxygen 29.91 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CaMn3+2O4 |
| Environment: |
In hydrothermal manganese oxide deposits. |
| IMA Status: |
Approved IMA 1963 |
| Locality: |
Tachgagalt, Ouarzazate, Morocco. Morocco in French "Maroc". Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Marokite  |
| Synonym: |
ICSD 28374 |
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PDF 16-709 |
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Marokite Image |
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Images:
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Marokite Crystallography
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| Axial Ratios: |
a:b:c =0.968:1:0.315 |
| Cell Dimensions: |
a = 9.71, b = 10.03, c = 3.16, Z = 4; V = 307.76 Den(Calc)= 4.62 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmab |
| X Ray Diffraction: |
By Intensity(I/Io): 2.22(1), 2.71(1), 2.29(0.8), |
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Physical Properties of Marokite
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| Cleavage: |
{100} Perfect, {001} Good |
| Color: |
Black. |
| Density: |
4.64 |
| Diaphaneity: |
Opaque |
| Habit: |
Fibrous - Crystals made up of fibers. |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Hardness: |
6.5 - Pyrite |
| Luster: |
Metallic |
| Streak: |
red brown |
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Optical Properties of Marokite
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| Optical Data: |
Biaxial (-) |
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NCalc= 2.28 - from Gladstone-Dale relationship (KC = 0.2771) where Ncalc=Dcalc*KC+1
NCalc= 2.29 - from Gladstone-Dale relationship (KC = 0.2771) where Ncalc=Dmeas*KC+1
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| Pleochroism (x): |
safflower red. |
| RL Anisotrophism: |
Strong, yellowish green to greenish yellow. |
| RL Bireflectance: |
Yellowish gray to gray-brown. |
| RL Color: |
Light gray to brown, with carmine-red internal reflections. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Marokite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
20.20 |
22.90 |
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| 420 nm |
19.30 |
21.90 |
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| 440 nm |
18.40 |
20.90 |
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| 460 nm |
17.70 |
20.00 |
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| 480 nm |
17.00 |
19.30 |
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| 500 nm |
16.50 |
18.70 |
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| 520 nm |
16.20 |
18.30 |
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| 540 nm |
16.00 |
18.20 |
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| 560 nm |
16.00 |
18.40 |
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| 580 nm |
16.00 |
18.70 |
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| 600 nm |
15.90 |
18.60 |
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| 620 nm |
15.70 |
18.30 |
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| 640 nm |
15.50 |
18.00 |
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| 660 nm |
15.40 |
17.80 |
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| 680 nm |
15.20 |
17.50 |
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| 700 nm |
15.10 |
17.30 |
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Calculated Relative Intensity Colors of Marokite in Air
Relative
Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
540% |
550% |
| R1 |
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| R2 |
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Calculated Properties of Marokite
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| Electron Density: |
Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Marokite =4.62 gm/cc.
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| Fermion Index: |
Fermion Index = 0.000396464
Boson Index = 0.999603536 |
| Photoelectric: |
PEMarokite = 15.72 barns/electron
U=PEMarokite x rElectron Density= 69.23 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Marokite is Not Radioactive |
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Marokite Classification
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| Dana Class: |
07.02.10.01 (07)Multiple Oxides |
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(07.02)(A+ B++)2 X4 Spinel group |
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(07.02.10)Dana Group |
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07.02.10.01 Marokite CaMn2O4 Pmab 2/m 2/m 2/m |
| Strunz Class: |
04.BC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.B - Metal:Oxygen = 3:4 and similar |
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04.BC -With medium-sized and large cations |
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04.BC.05 Marokite CaMn2O4 Pmab 2/m 2/m 2/m |
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Other Marokite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| See Also: |
Links to other databases for Marokite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Marokite Specimen Label here :
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Marokite
CaMn+++2O4
Dana No: 07.02.10.01 Strunz No: 04.BC.05
Locality:
Notes:
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