Manganarsite Mineral Data

Manganarsite Mineral Data +

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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).

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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 - TrapezohedralH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Manganarsite

Electron Density:

r_electron=3.37 gm/cc
note: r_Manganarsite=3.60 gm/cc.

Fermion Index

Fermion Index = 0.00013
Boson Index = 0.99987

Photoelectric:

PE_Manganarsite= 32.93 barns/electron
U=PE_Manganarsite x r_electron= 110.92 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganarsite is Not Radioactive

Manganarsite Classification

Dana Class:

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

(46.2)with miscellaneous formulae

(46.2.6)Dana Group

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

Strunz Class:

IV/J.10-10 IV - Oxides

IV/J - Arsenides with [As2O4]2- groups

IV/J.10 - Manganarsite - Leiteite series

IV/J.10-10 Manganarsite Mn3As204(OH)4 P 3₁2 ? 3 2

IV/J.10-20 Leiteite ZnAs2O4 P 2₁/c 2/m

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 -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 -École des Mines de Paris

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

Manganarsite

Mn++3As+++204(OH)4
Dana No: 46.2.6.1 Strunz No: IV/J.10-10
Locality:

Notes: