Cobaltlotharmeyerite Mineral Data

Cobaltlotharmeyerite Mineral Data

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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, Neust?dtel, 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 - PrismaticH-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.

Diaphaniety:

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

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:

r_electron=3.92 gm/cc
note: r_{Cobaltlotharmeyerite}=4.12 gm/cc.

Fermion Index

Fermion Index = 0.00247
Boson Index = 0.99753

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cobaltlotharmeyerite is Not Radioactive

Cobaltlotharmeyerite Classification

Dana Class:

37.1.6.3 (37)Anhydrous Acid Phosphates, etc

(37.1)with miscellaneous formulae

(37.1.6)Dana Group

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

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

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

37.1.6.4 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

VII/C.31-35 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.31 - Mawbyite - Gartrellite series

VII/C.31-02 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-04 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-05 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-06 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

VII/C.31-08 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-10 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-20 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

VII/C.31-30 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-35 Cobaltlotharmeyerite Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-36 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-40 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

VII/C.31-50 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

VII/C.31-74 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

VII/C.31-78 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

VII/C.31-80 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1

VII/C.31-90 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri

VII/C.31-92 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1

VII/C.31-98 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

VII/C.31-100 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Cobaltlotharmeyerite

Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2
Dana No: 37.1.6.3 Strunz No: VII/C.31-35
Locality:

Notes: