Schneebergite Mineral Data

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, Neust?dtel, 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.

Diaphaniety:

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

Optical Data:

Biaxial (+), a=1.93, b=1.95, g=1.98, bire=0.0500

Calculated Properties of Schneebergite

Electron Density:

r_electron=4.77 gm/cc
note: r_{Schneebergite}=5.24 gm/cc.

Fermion Index

Fermion Index = 0.00144
Boson Index = 0.99856

Photoelectric:

PE_{Schneebergite}= 461.60 barns/electron
U=PE_{Schneebergite} x r_electron=2,201.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schneebergite is Not Radioactive

Schneebergite Classification

Dana Class:

40.2.9.6 (40)Hydrated Phosphates, etc

(40.2)where A++ (B++)2 (XO4) · x(H2O)

(40.2.9)Helmutwinklerite Subgroup

40.2.9.1 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

40.2.9.2 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

40.2.9.3 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

40.2.9.4 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.5 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

40.2.9.6 Schneebergite ! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.7 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

40.2.9.8 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

Strunz Class:

VII/C.31-02 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions, cations of medium and big size: Fe, Mn, Zn, Mg and Ca, (NH4)1+

VII/C.31 - Mawbyite - Gartrellite series

VII/C.31-02 Schneebergite Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-04 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-05 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-06 Cabalzarite! Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2 C 2/m 2/m

VII/C.31-08 Nickellotharmeyerite! Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-10 Ferrilotharmeyerite Ca(Zn,Cu)(Fe,Zn)(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-20 Lotharmeyerite CaZnMn(AsO3OH)4(OH)3 C 2/m,C 2,Cm Mono

VII/C.31-30 Manganlotharmeyerite! Ca(Mn,Mg,)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-35 Cobaltlotharmeyerite! Ca(Co,Fe,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-36 Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m

VII/C.31-40 Thometzekite Pb(Cu,Zn)2(AsO4)2·2(H2O) C 2/m 2/m

VII/C.31-50 Tsumcorite PbZnFe(AsO4)2·(H2O) C 2/m 2/m

VII/C.31-74 Krettnichite! PbMn2(VO4)2(OH)2 C 2/m 2/m

VII/C.31-78 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1

VII/C.31-80 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1

VII/C.31-90 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri

VII/C.31-92 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1

VII/C.31-98 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2·2(H2O) P1 1

VII/C.31-100 Helmutwinklerite PbZn2(AsO4)2·2(H2O) P1 1

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Print or Cut-and-Paste your Schneebergite Specimen Label here :

Schneebergite

Bi(Co,Ni)2(AsO4)2(OH,H2O)2
Dana No: 40.2.9.6 Strunz No: VII/C.31-02
Locality:

Notes: