Schneebergite Mineral Data
General Schneebergite Information
Chemical Formula:
Bi(Co,Ni)2(AsO4)2(OH,H2O)2
Composition:
Molecular Weight = 594.02 gm
Calcium 2.02 % Ca 2.83 % CaO
Iron 1.88 % Fe 2.42 % FeO
Cobalt 10.91 % Co 15.36 % Co2 O3
Nickel 7.90 % Ni 10.06 % NiO
Bismuth 24.63 % Bi 27.45 % Bi2 O3
Arsenic 25.23 % As 38.69 % As2 O5
Hydrogen 0.49 % H 4.40 % H2 O
Oxygen 26.93 % O
______ ______
100.00 % 101.21 % = TOTAL OXIDE
Empirical Formula:
Bi0.7 Ca0.3 Co1.1 Ni0.8 Fe2+ 0.2 (AsO4 )2 (OH)1.1 (H2 O)0.9
Environment:
Secondary mineral found in the oxidized dump material. Tsumcorite group, Bi-dominant analog of cobaltlotharmeyerite.
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Dump material of the "Am Roten Berg" mining area, about 5 km SW of Schneeberg, Saxony, Germay. Link to MinDat.org Location Data.
Name Origin:
Named for the locality.
Synonym:
IMA1999-027
Schneebergite Image
Images:
Schneebergite
Comments: Prismatic, acicular crystals of schneebergite.
Location: Roter Berg, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany.
Scale: Picture size 1.7 mm.
© Thomas Witzke / Abraxas-Verlag
Schneebergite Crystallography
Axial Ratios:
a:b:c =1.4498:1:1.1978
Cell Dimensions:
a = 9.005, b = 6.211, c = 7.44, Z = 2; beta = 115.19° V = 376.55 Den(Calc)= 5.24
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
X Ray Diffraction:
By Intensity(I/Io ): 3.193(1)(112 ), 2.972(0.92)(201), 2.498(0.62)(112,310), 2.82(0.61)(021), 4.589(0.61)(111 ), 2.702(0.57)(311 ), 2.528(0.42), 1.869(0.37), 4.418(0.33),
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Physical Properties of Schneebergite
Cleavage:
None
Color:
Brown, Beige.
Diaphaneity:
Transparent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
4-4.5 - Between Fluorite and Apatite
Luster:
Subadamantine
Streak:
pale brown
Optical Properties of Schneebergite
Gladstone-Dale:
CI calc = 0.083 (Poor) - where the CI = (1-KPDcalc /KC ) KPDcalc = 0.1819,KC = 0.1984 Ncalc = 2.04
Optical Data:
Biaxial (+), a=1.93, b=1.95, g=1.98, bire=0.0500
Calculated Properties of Schneebergite
Electron Density:
Bulk Density (Electron Density)=4.77 gm/cc note: Specific Gravity of Schneebergite =5.24 gm/cc.
Fermion Index:
Fermion Index = 0.001449388 Boson Index = 0.998550612
Photoelectric:
PESchneebergite = 461.60 barns/electronU=PESchneebergite x r Electron Density=2,201.28 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Schneebergite is Not Radioactive
Schneebergite Classification
Dana Class:
40.02.09.06 (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 Schneebergite Information
References:
NAME( AmMin, Vol 88, p 253) PHYS. PROP.(AmMin, Vol 88, p 253) OPTIC PROP.(AmMin, Vol 88, p 253)
See Also:
Links to other databases for Schneebergite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Schneebergite
Bi(Co,Ni)2(AsO4)2(OH,H2O)2
Dana No: 40.02.09.06 Strunz No: 08.CG.15
Locality:
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