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Cobalttsumcorite

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Formula:
Pb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
System:
Monoclinic
Colour:
Brown to red-brown
Lustre:
Adamantine
Hardness:
Name:
For the relationship to Tsumcorite

Classification of Cobalttsumcorite

Approved 1999
8.CG.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
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Type Occurrence of Cobalttsumcorite

General Appearance of Type Material:
rosettes to 2 mm across, consisting of tabular crystals to 0.3 mm
Geological Setting of Type Material:
From the oxidation zone of the deposit

Physical Properties of Cobalttsumcorite

Adamantine
Diaphaneity (Transparency):
Transparent
Colour:
Brown to red-brown
Streak:
Light brown
Hardness (Mohs):
Hardness (Vickers):
VHN25=500 kg/mm2
Hardness Data:
Measured
Cleavage:
Distinct/Good
on {001}
Fracture:
Conchoidal
Density:
5.31 g/cm3 (Calculated)

Crystallography of Cobalttsumcorite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 9.097Å, b = 6.313Å, c = 7.555Å
β = 115.08°
Ratio:
a:b:c = 1.441 : 1 : 1.197
Unit Cell Volume:
V 393 ų
Z:
2
Morphology:
{_201} dominant, {001} and {_111}
Twinning:
None mentioned.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.656 (87)
4.462 (96)
3.243 (100)
3.010 (58)
2.868 (50)
2.733 (47)
2.538 (40)

Optical Data of Cobalttsumcorite

Type:
Biaxial (+)
RI values:
nα = 1.920 nβ = 1.940 nγ = 1.980
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none
Pleochroism:
Strong
Comments:
X=Light Brown
Y=Red-Brown
Z=Yellow

X^C = 15º in acute angle β
Y=b
Z^a = 40º in obtuse angle β

Chemical Properties of Cobalttsumcorite

Formula:
Pb(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
Essential elements:
All elements listed in formula:
Analytical Data:
NiO (5.20)
CoO (9.10)
ZnO (0.52)
PbO (34.23)
Al2O3 (0.29)
Fe2O3 (8.47)
P2O5 (0.06)
As2O5 (36.49)
SO3 (0.09)
H2O (4.65)
average values out of seven sets of electron microprobe data
Empirical Formula:
Pb0.97(Co0.77Fe3+0.67Ni0.44Zn0.44Al0.04)Σ1.96-[(AsO4)2.02(SO4)0.01(PO4)0.01]Σ2.04[(H2O)1.41(OH)0.46]Σ1.87

Relationship of Cobalttsumcorite to other Species

Other Members of Group:
CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
KaliochalciteKCu2(SO4)2[(OH)(H2O)]
Krettnichite(Pb,Sr)(Mn3+,Co)2(VO4)2 · 2(OH,H2O)
LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
ManganlotharmeyeriteCa(Mn3+,Zn)2(AsO4)2(OH,H2O)2
MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
MounanaitePbFe23+(VO4)2(OH,F)2
NatrochalciteNaCu2(SO4)2(OH) · 2H2O
Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
NickeltsumcoritePb(Ni,Fe3+)2(AsO4)2 · (H2O,OH)2
PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
YancowinnaitePbCuAl(AsO4)2OH · H2O
ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.05CassidyiteCa2(Ni2+,Mg)(PO4)2 · 2H2O
8.CG.05CollinsiteCa2(Mg,Fe2+)(PO4)2 · 2H2O
8.CG.05FairfielditeCa2(Mn2+,Fe2+)(PO4)2 · 2H2O
8.CG.05GaititeCa2Zn(AsO4)2 · 2H2O
8.CG.05MesseliteCa2(Fe2+,Mn2+)(PO4)2 · 2H2O
8.CG.05ParabrandtiteCa2Mn2+(AsO4)2 · 2H2O
8.CG.05TalmessiteCa2Mg(AsO4)2 · 2H2O
8.CG.05HilliteCa2(Zn,Mg)(PO4)2 · 2 H2O
8.CG.10BrandtiteCa2(Mn2+,Mg)(AsO4)2 · 2H2O
8.CG.10RoseliteCa2(Co2+,Mg)(AsO4)2 · 2H2O
8.CG.10WendwilsoniteCa2Mg(AsO4)2 · 2H2O
8.CG.10ZincroseliteCa2Zn(AsO4)2 · 2H2O
8.CG.10RruffiteCa2Cu(AsO4)2 · 2H2O
8.CG.15FerrilotharmeyeriteCa(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15LotharmeyeriteCa(Zn,Mn3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
8.CG.15MounanaitePbFe23+(VO4)2(OH,F)2
8.CG.15ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.15TsumcoritePb(Zn,Fe3+)2(AsO4)2 · 2(H2O,OH)
8.CG.15CobaltlotharmeyeriteCa(Co,Fe3+,Ni)2(AsO4)2 · 2(H2O,OH)
8.CG.15CabalzariteCa(Mg,Al,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Krettnichite(Pb,Sr)(Mn3+,Co)2(VO4)2 · 2(OH,H2O)
8.CG.15NickellotharmeyeriteCa(Ni,Fe3+,Co)2(AsO4)2 · 2(H2O,OH)
8.CG.15ManganlotharmeyeriteCa(Mn3+,Zn)2(AsO4)2(OH,H2O)2
8.CG.15Schneebergite(Bi3+,Ca)(Co,Ni,Fe3+)2(AsO4)2(OH,H2O)2
8.CG.15Nickelschneebergite(Bi3+,Ca)(Ni,Co,Fe3+)2(AsO4)2 · 2(OH,H2O)
8.CG.20GartrellitePb(Cu,Fe3+,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
8.CG.20HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
8.CG.20ZincgartrellitePb(Zn,Fe3+,Cu)2(AsO4)2 · 2(H2O,OH)
8.CG.20RappolditePb(Co,Ni,Zn)2(AsO4)2 · 2H2O
8.CG.20PhosphogartrellitePb(Cu,Fe3+)2(PO4,AsO4)2 · 2(H2O,OH)
8.CG.20LukrahniteCa(Cu,Zn)(Fe3+,Zn)(AsO4)2 · 2(H2O,OH)
8.CG.25PottsiteHPbBi(VO4)2 · 2H2O
8.CG.35NickeltalmessiteCa2Ni(AsO4)2 · 2H2O

Other Names for Cobalttsumcorite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Cobalttsumcorite

Reference List:
Krause, W., Bernhardt, H.-J., Effenberger, H., Martin, M. (2001): Cobalttsumcorite and nickellotharmeyerite, two new minerals from Schneeberg, Germany: description and crystal structure. Neues Jahrbuch für Mineralogie-Monatshefte: 2001, 558-576.

Lapis 30(7/8):68 (2005).

Internet Links for Cobalttsumcorite

Localities for Cobalttsumcorite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Saxony
    • Erzgebirge
      • Schneeberg District
        • Neustädtel
Th. Witzke collection
MinRec 33:351; Lapis 30(7/8):68 (2005)
Mineral and/or Locality  
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