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Cobalttsumcorite

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Roter Berg District, Schneeberg District, Erzgebirge, Saxony, Germany
© Stephan Wolfsried

Show Cobalttsumcorite Photos (3)
Formula:
Pb(Co,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
System:MonoclinicColour:Brown to red-brown
Lustre:AdamantineHardness:4½
Name:For the relationship to Tsumcorite


See also Unnamed (Ni-analogue of Cobalttsumcorite).

Classification of Cobalttsumcorite

IMA status:Approved 1999
Strunz 8th edition ID:7/C.31-36
Nickel-Strunz 10th (pending) edition ID: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

Type Locality:Roter Berg District, Schneeberg District, Erzgebirge, Saxony, Germany
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
Associated Minerals at type locality:
PlumbogummiteMawbyiteGalenaCobaltlotharmeyeriteArseniosiderite

Physical Properties of Cobalttsumcorite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:Brown to red-brown
Streak:Light brown
Hardness (Mohs):4½
Hardness (Vickers):VHN25=500 kg/mm2
Hardness Data:Measured
Cleavage:Distinct/Good
on {001}
Fracture:Conchoidal
Density (calculated):5.31 g/cm3

Crystallography of Cobalttsumcorite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
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:
d-spacingIntensity
4.656 (87)
4.462 (96)
3.243 (100)
3.010 (58)
2.868 (50)
2.733 (47)

Optical Data of Cobalttsumcorite

Type:Biaxial (+)
RI values: nα = 1.920 nβ = 1.940 nγ = 1.980
Maximum Birefringence:δ = 0.060

Chart 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,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
Essential elements:As, Co, H, O, Pb
All elements listed in formula:As, Co, Fe, H, Ni, O, Pb
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:
Pb
 
0.97
(Co
 
0.77
Fe
3+
0.67
Ni
 
0.44
Zn
 
0.44
Al
 
0.04
)
 
Σ1.96-
[(AsO
 
4
)
 
2.02
(SO
 
4
)
 
0.01
(PO
 
4
)
 
0.01
]
 
Σ2.04
[(H
 
2
O)
 
1.41
(OH)
 
0.46
]
 
Σ1.87

Relationship of Cobalttsumcorite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.CG.05Cassidyite
Ca
 
2
(Ni
2+
 
,Mg)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Collinsite
Ca
 
2
(Mg,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Fairfieldite
Ca
 
2
(Mn
2+
 
,Fe
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Gaitite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Messelite
Ca
 
2
(Fe
2+
 
,Mn
2+
 
)[PO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Parabrandtite
Ca
 
2
Mn
2+
 
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05Talmessite
Ca
 
2
Mg[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.05β-Uranophane
Ca(UO
 
2
)
 
2
[HSiO
 
4
]
 
2
 · 5H
 
2
O
8.CG.05Hillite
Ca
 
2
(Zn,Mg)[PO
 
4
]
 
2
 · 2 H
 
2
O
8.CG.10Brandtite
Ca
 
2
(Mn
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Roselite
Ca
 
2
(Co
2+
 
,Mg)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Wendwilsonite
Ca
 
2
(Mg,Co
2+
 
)[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.10Zincroselite
Ca
 
2
Zn[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.15Ferrilotharmeyerite
Ca(Fe
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Lotharmeyerite
Ca(Zn,Mn
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Mawbyite
Pb(Fe
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Mounanaite
PbFe
3+
2
[VO
 
4
]
 
2
 · 2(OH,F)
8.CG.15Thometzekite
Pb(Cu,Zn)
 
2
[AsO
 
4
,SO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Tsumcorite
Pb(Zn,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cobaltlotharmeyerite
Ca(Co,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Cabalzarite
Ca(Mg,Al,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Krettnichite
(Pb,Sr)(Mn
3+
 
,Co)
 
2
[VO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Nickellotharmeyerite
Ca(Ni,Fe
3+
 
,Co)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.15Manganlotharmeyerite
Ca(Mn
3+
 
,Zn)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Schneebergite
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.15Nickelschneebergite
(Bi
3+
 
,Ca)(Ni,Co,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
8.CG.20Gartrellite
Pb(Cu,Fe
3+
 
,Zn)
 
2
[AsO
 
4
,SO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Helmutwinklerite
Pb(Zn,Cu)
 
2
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.20Zincgartrellite
Pb(Zn,Fe
3+
 
,Cu)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Rappoldite
Pb(Co,Ni,Zn)
 
2
[AsO
 
4
]
 
2
 · 2H
 
2
O
8.CG.20Phosphogartrellite
Pb(Cu,Fe
3+
 
)
 
2
[PO
 
4
,AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.20Lukrahnite
Ca(Cu,Zn)(Fe
3+
 
,Zn)[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
8.CG.25Pottsite
HPbBi(VO
 
4
)
 
2
·2H
 
2
O
8.CG.35Nickeltalmessite
Ca
 
2
Ni(AsO
 
4
)
 
2
·2H
 
2
O

Other Names for Cobalttsumcorite

Synonyms:
IMA1999-029
Other Languages:
German:Cobalttsumcorit
Kobalttsumcorit
Russian:Кобальтцумкорит
Spanish:Cobalttsumcorita

Other Information

Fluorescence in UV light:None
Health Warning: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

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    Localities for Cobalttsumcorite

    (TL) indicates type locality. ? 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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