Manganite Mineral Data

General Manganite Information

Chemical Formula:

MnO(OH)

Composition:

Molecular Weight = 87.94 gm

Manganese 62.47 % Mn 89.76 % Mn₂O₃

Hydrogen 1.15 % H 10.24 % H₂O

Oxygen 36.39 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn³⁺O(OH)

Environment:

Formed in low-temperature hydrothermal or hot-spring manganese deposits.

IMA Status:

Valid Species (Pre-IMA) 1827

Locality:

Ilfeld, Harz, Germany Link to MinDat.org Location Data.

Name Origin:

Named after its chemical composition.

Name Pronunciation:

Manganite + Pronunciation

Synonym:

Brown manganese ore

ICSD 27456

PDF 41-1379

Manganite Image

Images:

Manganite

Comments: Lustrous feathery crystals of manganite to 0.75 cm.
Location: N'Chwaning Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 7.8 x 4.2 cm.
© John Veevaert

Images:

Manganite Sudoite

Comments: Pinkish to nearly white earthy sudoite with dark manganite.
Location: Ilfeld, Nordhausen, Erfurt district, Harz Mts, Thuringia, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Manganite Vaterite Defernite

Comments: Opaque white fibrous vaterite with red defernite and black manganite.
Location: Kombat Mine, Otavi, Otjozondjupa, Namibia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Manganite Crystallography

Axial Ratios:

a:b:c =1.6931:1:1.0871

Cell Dimensions:

a = 8.94, b = 5.28, c = 5.74, Z = 8; beta = 90° V = 270.95 Den(Calc)= 4.31

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: B21/d

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

By Intensity(I/I_o): 3.4(1), 2.64(0.6), 2.28(0.5),

Forms:

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Forms: ( 8 1 0) ( 0 1 0) ( 2 1 0) ( 1 0 1) ( 1 1 1)

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Crystal Structure:

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Kohler T , Armbruster T , Libowitzky E , Journal of Solid State Chemistry , 133 (1997) p.486-500, Hydrogen bonding and Jahn-Teller distortion in groutite, alpha-MnOOH,, and manganite, gamma-MnOOH, and their relations to the manganese, dioxides ramsdellite and pyrolusite, Locality: Nchwaning Mine, Kalahari manganese field, Republic of South Africa, Note: Uiso corrected

Physical Properties of Manganite

Cleavage:

{010} Perfect

Color:

Black, Gray, Grayish black.

Density:

4.3 - 4.4, Average = 4.34

Diaphaneity:

Opaque

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Pseudo Orthorhombic - Crystals show an orthorhombic shape.

Hardness:

4 - Fluorite

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Magnetism:

Nonmagnetic

Streak:

dark brown

Optical Properties of Manganite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3117,KPDmeas= 0.3088,KC= 0.305
Ncalc = 2.31 - 2.34

Optical Data:

Biaxial (+), a=2.25, b=2.25, g=2.53, bire=0.2800

Pleochroism (x):

faint reddish brown.

Pleochroism (z):

faint red brown.

RL Anisotrophism:

Weak.

RL Bireflectance:

Distinct, in grays.

RL Color:

Gray white with brownish tint with blood red internal reflections.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Manganite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	18.00	25.10
420 nm	18.00	24.80
440 nm	18.00	24.50
460 nm	17.90	24.10
480 nm	17.80	23.70
500 nm	17.60	23.20
520 nm	17.30	22.70
540 nm	17.00	22.20
560 nm	16.80	21.60
580 nm	16.50	21.20
600 nm	16.30	20.80
620 nm	16.10	20.60
640 nm	16.00	20.30
660 nm	15.80	20.10
680 nm	15.70	19.90
700 nm	15.70	19.70

**Calculated Relative Intensity Colors of Manganite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%
R₁
R₂

Calculated Properties of Manganite

Electron Density:

Bulk Density (Electron Density)=4.15 gm/cc
note: Specific Gravity of Manganite =4.35 gm/cc.

Fermion Index:

Fermion Index = 0.0001763676
Boson Index = 0.9998236324

Photoelectric:

PE_Manganite= 16.21 barns/electron
U=PE_Manganite x rElectron Density= 67.35 barns/cc.

Radioactivity:

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

Manganite Classification

Dana Class:

06.01.03.01 (06)Hydroxides and Oxides Containing Hydroxyl

(06.01)where X+++O OH

(06.01.03)Dana Group

06.01.03.01 Manganite MnO(OH) B21/d 2/m

Strunz Class:

04.FD.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FD -Hydroxides with OH, without H2O; chains of edge-sharing octahedra

04.FD.15 Manganite MnO(OH) B21/d 2/m

Other Manganite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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

Manganite

MnO(OH)
Dana No: 06.01.03.01 Strunz No: 04.FD.15
Locality:

Notes: