Mineralogy Database

Marokite Mineral Data

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General Marokite Information

Help on Chemical  Formula: Chemical Formula: CaMn+++2O4
Help on Composition: Composition: Molecular Weight = 213.95 gm
   Calcium    18.73 %  Ca   26.21 % CaO
   Manganese  51.36 %  Mn   73.79 % Mn2O3
   Oxygen     29.91 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMn3+2O4
Help on Environment: Environment: In hydrothermal manganese oxide deposits.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Tachgagalt, Ouarzazate, Morocco. Morocco in French "Maroc". Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Marokite Say MAROKITE
Help on Synonym: Synonym: ICSD 28374
  PDF 16-709
 

Marokite Image

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  Marokite

Comments: Dark brown crystalline massive marokite.
Location: vein #2, Tachgagalt, Ouarzazet, Morocco. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Marokite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.968:1:0.315
Help on Cell Dimensions: Cell Dimensions: a = 9.71, b = 10.03, c = 3.16, Z = 4; V = 307.76 Den(Calc)= 4.62
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmab
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.22(1), 2.71(1), 2.29(0.8),
 

Physical Properties of Marokite

Help on Cleavage: Cleavage: {100} Perfect, {001} Good
Help on Color: Color: Black.
Help on Density: Density: 4.64
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Metallic
Help on Streak: Streak: red brown
 

Optical Properties of Marokite

Help on Optical Data: Optical Data: Biaxial (-)
  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
Help on Pleochroism (x): Pleochroism (x): safflower red.
Help on RL Anisotrophism: RL Anisotrophism: Strong, yellowish green to greenish yellow.
Help on RL Bireflectance: RL Bireflectance: Yellowish gray to gray-brown.
Help on RL Color: RL Color: Light gray to brown, with carmine-red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Marokite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   20.20   22.90 
   
 420 nm   19.30   21.90 
 440 nm   18.40   20.90 
 460 nm   17.70   20.00 
 480 nm   17.00   19.30 
 500 nm   16.50   18.70 
 520 nm   16.20   18.30 
 540 nm   16.00   18.20 
 560 nm   16.00   18.40 
 580 nm   16.00   18.70 
 600 nm   15.90   18.60 
 620 nm   15.70   18.30 
 640 nm   15.50   18.00 
 660 nm   15.40   17.80 
 680 nm   15.20   17.50 
 700 nm   15.10   17.30 
Calculated Relative Intensity Colors of Marokite in Air
Relative
Intensity
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 540% 550%
R1                        
R2                        
 

Calculated Properties of Marokite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Marokite =4.62 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000396464
Boson Index = 0.999603536
Help on Photoelectric: Photoelectric: PEMarokite = 15.72 barns/electron
U=PEMarokite x rElectron Density= 69.23 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Marokite is Not Radioactive
 

Marokite Classification

Help on  Dana Class: Dana Class: 07.02.10.01 (07)Multiple Oxides
  (07.02)(A+ B++)2 X4 Spinel group
  (07.02.10)Dana Group
 
07.02.10.01 Marokite CaMn2O4 Pmab 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.BC.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.B - Metal:Oxygen = 3:4 and similar
  04.BC -With medium-sized and large cations
 
04.BC.05 Marokite CaMn2O4 Pmab 2/m 2/m 2/m
 

Other Marokite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: 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 :

Marokite

CaMn+++2O4
Dana No: 07.02.10.01 Strunz No: 04.BC.05
Locality:

 

Notes:

 

 
   
 


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