Manganlotharmeyerite Mineral Data

General Manganlotharmeyerite Information

Chemical Formula:

Ca(Mn+++,Mg,)2(AsO4)2(OH,H2O)2

Composition:

Molecular Weight = 414.80 gm

Calcium 8.70 % Ca 12.17 % CaO

Magnesium 2.34 % Mg 3.89 % MgO

Manganese 13.24 % Mn 19.03 % Mn₂O₃

Arsenic 36.12 % As 55.41 % As₂O₅

Hydrogen 1.02 % H 9.12 % H₂O

Oxygen 38.57 % O

______ ______

100.00 % 99.61 % = TOTAL OXIDE

Empirical Formula:

Ca_0.92(Mn³⁺_0.5)2(Mg_0.2)2(As)O₁₀H_4.2

Environment:

In carbonate-hosted manganese ore.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Starlera Fe-Mn deposit, Val Ferrera, Eastern Alps, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named as the Mn-dominant lotharmeyerite.

Synonym:

IMA2001-026

Manganlotharmeyerite Image

Images:

Manganlotharmeyerite

Comments: Scanning electron micrograph of subparallel crystals of manganlotharmeyerite.
Location: Massive braunite ores at the Starlera Mn deposit in the Eastern Alps of Switzerland. Scale: See Picture.
© Canadian Mineralogist

Manganlotharmeyerite Crystallography

Axial Ratios:

a:b:c =1.4511:1:1.1857

Cell Dimensions:

a = 9.043, b = 6.2314, c = 7.3889, Z = 2; beta = 116.392° V = 372.97 Den(Calc)= 3.69

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 2.555(1)(221,312), 3.182(1)(112), 2.718(0.8)(311),4.93(0.8)(110), 2.134(0.7)(202,221), 2.822(0.7)(021), 2.927(0.7)(201),

Physical Properties of Manganlotharmeyerite

Cleavage:

{001} Distinct

Color:

Brownish red, Dark reddish orange.

Density:

3.77

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

3 - Calcite

Luster:

Adamantine

Streak:

light brown

Optical Properties of Manganlotharmeyerite

Gladstone-Dale:

CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.048 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2216,KPDmeas= 0.2169,KC= 0.2114
Ncalc = 1.78 - 1.8

Optical Data:

Biaxial (+), a=1.785, b=1.814, g=1.854, bire=0.0690, 2V(Calc)=84, 2V(Meas)=~85. Dispersion r < v weak.

Calculated Properties of Manganlotharmeyerite

Electron Density:

Bulk Density (Electron Density)=3.60 gm/cc
note: Specific Gravity of Manganlotharmeyerite =3.77 gm/cc.

Fermion Index:

Fermion Index = 0.0026478418
Boson Index = 0.9973521582

Photoelectric:

PE_{Manganlotharmeyerite}= 29.13 barns/electron
U=PE_{Manganlotharmeyerite} x rElectron Density= 104.84 barns/cc.

Radioactivity:

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

Manganlotharmeyerite Classification

Dana Class:

40.02.03.05 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) ï¿½ x(H2O)

(40.02.03)Roselite Subgroup (Monoclinic: P21/c)

40.02.03.01 Roselite Ca2(Co,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.02 Brandtite Ca2(Mn,Mg)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.03 Zincroselite Ca2Zn(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.04 Wendwilsonite Ca2(Mg,Co)(AsO4)2•2(H2O) P 2₁/c 2/m

40.02.03.05 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

08.CG.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CG -With large and medium-sized cations, RO4:H2O = 1:1

08.CG.15 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

08.CG.15 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

08.CG.15 Mounanaite PbFe2(VO4)2(OH)2 P1 1

08.CG.15 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m

08.CG.15 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m

08.CG.15 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

08.CG.15 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

08.CG.15 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Other Manganlotharmeyerite Information

References:

NAME( CanMin, v 41, p 818) PHYS. PROP.(CanMin, v 41, p 818) OPTIC PROP.(CanMin, v 41, p 818)

See Also:

Links to other databases for Manganlotharmeyerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Manganlotharmeyerite

Ca(Mn+++,Mg,)2(AsO4)2(OH,H2O)2
Dana No: 40.02.03.05 Strunz No: 08.CG.15
Locality:

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