Schneebergite Mineral Data

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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 % Co₂O₃

Nickel 7.90 % Ni 10.06 % NiO

Bismuth 24.63 % Bi 27.45 % Bi₂O₃

Arsenic 25.23 % As 38.69 % As₂O₅

Hydrogen 0.49 % H 4.40 % H₂O

Oxygen 26.93 % O

______ ______

100.00 % 101.21 % = TOTAL OXIDE

Empirical Formula:

Bi_0.7Ca_0.3Co_1.1Ni_0.8Fe²⁺_0.2(AsO₄)₂(OH)_1.1(H₂O)_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 - PrismaticH-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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),

Forms:

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Forms: ( 1 1 1) ( 2 0 1) ( 1 1 1) ( 0 0 1)

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Crystal Structure:

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Krause W , Bernhardt H J , Effenberger H , Witzke T , European Journal of Mineralogy , 14 (2002) p.115-126, Schneebergite and nickelschneebergite from Schneeberg, Saxony, Germany:, the first Bi-bearing members of the tsumcorite group, Sample: #358, Locality: Schneeberg, Saxony, Germany

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:

PE_{Schneebergite}= 461.60 barns/electron
U=PE_{Schneebergite} x rElectron 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:

Notes: