Marokite Mineral Data

General Marokite Information

Chemical Formula:

CaMn+++2O4

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

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

PDF 16-709

Marokite Image

Images:

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

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmab

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.22(1), 2.71(1), 2.29(0.8),

Crystal Structure:

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Help on Above

Ross C R , Rubie D C , Paris E , American Mineralogist , 75 (1990) p.1249-1252, Rietveld refinement of the high-pressure polymorph of Mn3O4

View Additional jPOWD Structure files for Marokite
[1]

Physical Properties of Marokite

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

Optical Properties of Marokite

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

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	∑ 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

Electron Density:

Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Marokite =4.62 gm/cc.

Fermion Index:

Fermion Index = 0.000396464
Boson Index = 0.999603536

Photoelectric:

PE_Marokite= 15.72 barns/electron
U=PE_Marokite x rElectron Density= 69.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Marokite is Not Radioactive

Marokite Classification

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

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

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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Ask about Marokite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: