Cobalttsumcorite Mineral Data

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General Cobalttsumcorite Information

Chemical Formula:

Pb(Co,Fe)2(AsO4)2(OH,H2O)2

Composition:

Molecular Weight = 607.66 gm

Iron 6.43 % Fe 8.28 % FeO

Cobalt 7.76 % Co 10.92 % Co₂O₃

Nickel 3.86 % Ni 4.92 % NiO

Arsenic 24.66 % As 37.82 % As₂O₅

Hydrogen 0.53 % H 4.74 % H₂O

Lead 30.69 % Pb 33.06 % PbO

Oxygen 26.07 % O

______ ______

100.00 % 99.74 % = TOTAL OXIDE

Empirical Formula:

Pb_0.9Co_0.8Fe²⁺_0.7Ni_0.4(AsO₄)₂(OH)_0.6(H₂O)_1.3

Environment:

Secondary mineral found in dump material from an oxidation zone.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

"Am Roten Berg" mining area, 4.8 km SW of Schneeberg, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the chemical and structural relationship to tsumcorite

Synonym:

IMA1999-029

Cobalttsumcorite Image

Images:

Cobalttsumcorite

Comments: Brown crystals of cobalttsumcorite.
Location: Rappold Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Cobalttsumcorite Crystallography

Axial Ratios:

a:b:c =1.4409:1:1.1967

Cell Dimensions:

a = 9.097, b = 6.313, c = 7.555, Z = 2; beta = 115.08° V = 392.97 Den(Calc)= 5.14

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): 3.243(1)(112), 4.462(0.96)(201), 4.656(0.87)(111),3.01(0.58)(201), 2.868(0.5)(021), 2.733(0.47)(311), 2.55(0.4),

Crystal Structure:

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Krause W , Bernhardt H J , Effenberger H , Martin M , Neues Jahrbuch fur Mineralogie, Monatshefte , 2001 (2001) p.588-576, Cobalttsumcorite and nickellotharmeyerite, two new minerals from, Schneeberg, Germany: description and crystal structure, Locality: Schneeberg, Germany

Physical Properties of Cobalttsumcorite

Cleavage:

{001} Good

Color:

Brown, Reddish brown.

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Subadamantine

Streak:

light brown

Optical Properties of Cobalttsumcorite

Gladstone-Dale:

CI calc= -0.015 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1842,KC= 0.1815
Ncalc = 1.93

Optical Data:

Biaxial (+), a=1.92, b=1.94, g=1.98, bire=0.0600

Calculated Properties of Cobalttsumcorite

Electron Density:

Bulk Density (Electron Density)=4.62 gm/cc
note: Specific Gravity of Cobalttsumcorite =5.14 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_{Cobalttsumcorite}= 548.25 barns/electron
U=PE_{Cobalttsumcorite} x rElectron Density=2,533.93 barns/cc.

Radioactivity:

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

Cobalttsumcorite Classification

Dana Class:

40.02.09.08 (40)Hydrated Phosphates, etc

(40.02)where A++ (B++)2 (XO4) · x(H2O)

(40.02.09)Helmutwinklerite Subgroup

40.02.09.01 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m

40.02.09.02 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1

40.02.09.03 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m

40.02.09.04 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.05 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1

40.02.09.06 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.07 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.02.09.08 Cobalttsumcorite! Pb(Co,Fe)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 Cobalttsumcorite Information

References:

NAME( AmMin, vol 87, p 996) PHYS. PROP.(AmMin, vol 87, p 996) OPTIC PROP.(AmMin, vol 87, p 996)

See Also:

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

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

Cobalttsumcorite

Pb(Co,Fe)2(AsO4)2(OH,H2O)2
Dana No: 40.02.09.08 Strunz No: 08.CG.15
Locality:

Notes: