Manganarsite Mineral Data

General Manganarsite Information

Chemical Formula:

Mn++3As+++204(OH)4

Composition:

Molecular Weight = 446.68 gm

Manganese 36.90 % Mn 47.64 % MnO

Arsenic 33.55 % As 44.29 % As₂O₃

Hydrogen 0.90 % H 8.07 % H₂O

Oxygen 28.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₃As₂O₄(OH)₄

IMA Status:

Approved IMA 1986

Locality:

Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after the composition (Manganese, Arsenic).

Name Pronunciation:

Manganarsite + Pronunciation

Manganarsite Crystallography

Axial Ratios:

a:c = 1:0.6333

Cell Dimensions:

a = 11.451, c = 7.252, Z = 4; V = 823.52 Den(Calc)= 3.60

Crystal System:

Trigonal - Trapezohedral H-M Symbol (3 2) Space Group: P 3₁2 ?

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

By Intensity(I/I_o): 2.662(1), 1.845(0.7), 1.652(0.6),

Physical Properties of Manganarsite

Cleavage:

{001} Perfect

Color:

Pink brown.

Density:

3.64

Diaphaneity:

Translucent

Habit:

Hexagonal - Six-sided crystal shape in cross-section or habit.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Manganarsite

Gladstone-Dale:

CI meas= 0.031 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2208,KPDmeas= 0.2184,KC= 0.2254
Ncalc = 1.81 - 1.82

Optical Data:

Uniaxial (-), e=1.78, w=1.81, bire=0.0300.

Calculated Properties of Manganarsite

Electron Density:

Bulk Density (Electron Density)=3.37 gm/cc
note: Specific Gravity of Manganarsite =3.60 gm/cc.

Fermion Index:

Fermion Index = 0.0001388955
Boson Index = 0.9998611045

Photoelectric:

PE_Manganarsite= 32.93 barns/electron
U=PE_Manganarsite x rElectron Density= 110.92 barns/cc.

Radioactivity:

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

Manganarsite Classification

Dana Class:

46.02.06.01 (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites

(46.02)with miscellaneous formulae

(46.02.06)Dana Group

46.02.06.01 Manganarsite Mn3As204(OH)4 P 3₁2 ? 3 2

Strunz Class:

04.JB.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.J - Arsenites, Antimonites, Bismuthites, Sulfites,

04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O

04.JB.10 Manganarsite Mn3As204(OH)4 P 3₁2 ? 3 2

Other Manganarsite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Manganarsite :
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

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Manganarsite

Mn++3As+++204(OH)4
Dana No: 46.02.06.01 Strunz No: 04.JB.10
Locality:

Notes:

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