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Schneebergite

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Roter Berg District, Schneeberg District, Erzgebirge, Saxony, Germany
© Thomas Witzke

Show Schneebergite Photos (4)
Formula:
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
System:MonoclinicColour:beige-white to yellowish ...
Hardness:4 - 4½
Name:After the type locality at Schneeberg, Saxony, Germany.


Tsumcorite Group.

Classification of Schneebergite

IMA status:Approved 1999
Strunz 8th edition ID:7/C.31-02
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 Schneebergite

Type Locality:Roter Berg District, Schneeberg District, Erzgebirge, Saxony, Germany
General Appearance of Type Material:tabular to lath-like, or acicular crystals to 0.5 mm in length
Place of Conservation of Type Material:Museum of Mineralogy and Geology, Dresden, Germany
Year of Discovery:2002
Geological Setting of type material:in quartz casts of decomposed cobalt and nickel arsenides
Associated Minerals at type locality:
ZeuneriteWaylanditeScoroditeQuartzPreisingerite
NickellotharmeyeriteFerrilotharmeyeriteCobaltlotharmeyeriteBariopharmacosiderite

Physical Properties of Schneebergite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:beige-white to yellowish brown, brown
Streak:white to pale brown
Hardness (Mohs):4 - 4½
Tenacity:Brittle
Cleavage:None Observed
Fracture:Conchoidal
Density (calculated):5.28 g/cm3

Crystallography of Schneebergite

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 = 9.005Å, b = 6.211Å, c = 7.44Å
β = 115.19°
Ratio:a:b:c = 1.45 : 1 : 1.198
Unit Cell Volume:V 376.55 ų (Calculated from Unit Cell)
Z:2
Morphology:Tabular on {-201}, also showing {001}, {101}, {-101}, {-102} and {-111}.
X-Ray Powder Diffraction:
d-spacingIntensity
4.598(61)
3.193(100)
2.972(92)
2.820(61)
2.702(57)

Optical Data of Schneebergite

Type:Biaxial (+)
RI values: nα = 1.930 nβ = 1.950 nγ = 1.980
2V:Calculated: 85°
Maximum Birefringence:δ = 0.050

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Pleochroism:Weak
Comments:Weak to distinct, depending on Fe content. With X = Z = pale yellow, Y = brown.

Chemical Properties of Schneebergite

Formula:
(Bi
3+
 
,Ca)(Co,Ni,Fe
3+
 
)
 
2
[AsO
 
4
]
 
2
 · 2(OH,H
 
2
O)
All elements listed in formula:As, Bi, Ca, Co, Fe, H, Ni, O
Analyical Data:Electron microprobe data of Type Locality material
CaO      2.72
NiO      9.35
CoO     13.31
PbO      0.11
Fe^2O^3  2.95
Bi^2O^3 29.01
As^2O^5 38.42
SO^3     0.11
H^2O     4.40 (TGA)

Total: 100.38 wt. %
Empirical Formula:
(Bi
 
0.74
Ca
 
0.29
)
 
Σ1.03
(Co
 
1.06
Ni
 
0.75
Fe
 
0.22
)
 
Σ2.03
[(AsO
 
4
)
 
1.99
(SO
 
4
)
 
0.01
)]
 
Σ2.00
[(OH)
 
1.09
(H
 
2
O)
 
0.91
]
 
Σ2.00

Relationship of Schneebergite 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.15Cobalttsumcorite
Pb(Co,Fe
3+
 
,Ni)
 
2
[AsO
 
4
]
 
2
 · 2(H
 
2
O,OH)
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.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

Other Names for Schneebergite

Synonyms:
IMA1999-027
Other Languages:
German:Schneebergit
Spanish:Schneebergita

Other Information

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 Schneebergite

Reference List:Krause, W., Bernhardt, H.-J., Effenberger, H., and Witzke, T. (2002): Schneebergite and nickelschneebergite from Schneeberg, Saxony, Germany: the first Bi-bearing members of the tsumcorite group. European Journal of Mineralgy: 14: 115-126.

American Mineralogist (2003): 88: 253 (absract).

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    Localities for Schneebergite

    (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
    		W. Krause et al. (2002) Eur. J. Mineral. 14, 115-126
    Italy
     
    • Trentino-Alto Adige
      • Bolzano Province (South Tyrol)
        • Passiria Valley (Passeier Valley)
    		Exel, R. (1987): Guida mineralogica del Trentino e del Sudtirolo. Athesia, Bolzano, 204 pp.
    Mineral and/or Locality
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