Marokite Mineral Data

Marokite Mineral Data +

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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.

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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

Diaphaniety:

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:

r_electron=4.41 gm/cc
note: r_Marokite=4.62 gm/cc.

Fermion Index

Fermion Index = 0.00039
Boson Index = 0.99961

Photoelectric:

PE_Marokite= 15.72 barns/electron
U=PE_Marokite x r_electron= 69.23 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Marokite is Not Radioactive

Marokite Classification

Dana Class:

7.2.10.1 (7)Multiple Oxides

(7.2)(A+ B++)2 X4 Spinel group

(7.2.10)Dana Group

7.2.10.1 Marokite CaMn2O4 Pmab 2/m 2/m 2/m

Strunz Class:

IV/B.05-60 IV - Oxides

IV/B - Oxides with metal : oxygen = 3:4 (spinel type M3O4 and related)

IV/B.05 - Hausmannite - Filipstadite series

IV/B.05-10 Hausmannite MnMn2O4 I 4₁/amd 4/m 2/m 2/m

IV/B.05-20 Iwakiite Mn(Fe,Mn)2O4 P 4₁/nnm 4/m 2/m 2/m

IV/B.05-30 Donathite? (Fe,Mg)(Cr,Fe)2O4 P 4/nnm 4/m 2/m 2/m

IV/B.05-40 Hetaerolite ZnMn2O4 I 4₁/amd 4/m 2/m 2/m

IV/B.05-50 Hydrohetaerolite Zn2Mn4O8·(H2O) I 4₁/amd 4/m 2/m 2/m

IV/B.05-60 Marokite CaMn2O4 Pmab 2/m 2/m 2/m

IV/B.05-65 Tegengrenite! (Mg,Mn)2Sb0.5(Mn,Si,Ti)0.5O4 R 3 or R 3- Trig

IV/B.05-80 Filipstadite (Mn,Mg)4SbFeO8 pseudo ISO 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Marokite Specimen Label here :

Marokite

CaMn+++2O4
Dana No: 7.2.10.1 Strunz No: IV/B.05-60
Locality:

Notes: