Cobaltlotharmeyerite Mineral Data

General Cobaltlotharmeyerite Information

Chemical Formula:

Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2

Composition:

Molecular Weight = 468.87 gm

Calcium 8.55 % Ca 11.96 % CaO

Iron 8.34 % Fe 10.73 % FeO

Cobalt 12.57 % Co 17.69 % Co₂O₃

Nickel 3.76 % Ni 4.78 % NiO

Arsenic 31.96 % As 49.02 % As₂O₅

Hydrogen 0.71 % H 6.34 % H₂O

Oxygen 34.12 % O

______ ______

100.00 % 100.51 % = TOTAL OXIDE

Empirical Formula:

CaCoFe²⁺_0.7Ni_0.3(AsO₄)₂(OH)_0.7(H₂O)_1.3

Environment:

Secondary phosphate mineral in cobalt and nickel-bearing ore dumps. Tsumcorite group.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

On dump material from the mining area "Am RotenBerg," approximately 4.8 km SW of the center of Schneeberg, Saxony, Germay. Link to MinDat.org Location Data.

Name Origin:

Named as the cobalt dominant analogue of lotharmeyerite,

Synonym:

ICSD 89036

IMA1997-027

Cobaltlotharmeyerite Image

Images:

Cobaltlotharmeyerite

Comments: Brown crystalline aggregates of cobaltlotharmeyerite on matrix.
Location: Sauschwart Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm..
© Thomas Witzke / Abraxas-Verlag

Cobaltlotharmeyerite Crystallography

Axial Ratios:

a:b:c =1.4484:1:1.1911

Cell Dimensions:

a = 9.024, b = 6.23, c = 7.421, Z = 2; beta = 115.15° V = 377.65 Den(Calc)= 4.12

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): 2.545(1), 2.828(0.88), 3.188(0.85),2.972(0.82), 4.955(0.66), 3.398(0.54), 3.115(0.51),

Physical Properties of Cobaltlotharmeyerite

Cleavage:

None

Color:

Brown.

Diaphaneity:

Translucent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Streak:

light brown

Optical Properties of Cobaltlotharmeyerite

Gladstone-Dale:

CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1958,KC= 0.2129
Ncalc = 1.88

Optical Data:

Biaxial (+), a=1.78, b=1.79, g=1.85, bire=0.0700, 2V(Calc)=46, 2V(Meas)=48. Dispersion r > v distinct.

Calculated Properties of Cobaltlotharmeyerite

Electron Density:

Bulk Density (Electron Density)=3.92 gm/cc
note: Specific Gravity of Cobaltlotharmeyerite =4.12 gm/cc.

Fermion Index:

Fermion Index = 0.0024721539
Boson Index = 0.9975278461

Photoelectric:

PE_{Cobaltlotharmeyerite}= 31.29 barns/electron
U=PE_{Cobaltlotharmeyerite} x rElectron Density= 122.56 barns/cc.

Radioactivity:

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

Cobaltlotharmeyerite Classification

Dana Class:

37.01.06.03 (37)Anhydrous Acid Phosphates, etc

(37.01)with miscellaneous formulae

(37.01.06)Lotharmeyerite Series

37.01.06.01 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

37.01.06.02 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

37.01.06.03 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

37.01.06.04 Nickellotharmeyerite! Ca(Ni,Fe,Co)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 Cobaltlotharmeyerite Information

References:

NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)

See Also:

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

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Cobaltlotharmeyerite

Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2
Dana No: 37.01.06.03 Strunz No: 08.CG.15
Locality:

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