Rappoldite Mineral Data (original) (raw)
General Rappoldite Information
Chemical Formula:
Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O)
Composition:
Molecular Weight = 641.37 gm
Zinc 4.08 % Zn 5.08 % ZnO
Cobalt 9.19 % Co 11.68 % CoO
Nickel 5.49 % Ni 6.99 % NiO
Arsenic 23.36 % As 35.84 % As2O5
Hydrogen 0.63 % H 5.62 % H2O
Lead 32.31 % Pb 34.80 % PbO
Oxygen 24.95 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
PbCoNi0.6Zn0.4(AsO4)2•2(H2O)
Environment:
Co-dominant analogue of helmutwinklerite associated with cobaltlotharmeyerite as overgrowths on quartz.
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Dump material from the Rappold mine near Schneeberg, Saxony, Germay. Link to MinDat.org Location Data.
Name Origin:
Named after the locality.
Synonym:
IMA1998-015
Rappoldite Image
Images:
Rappoldite Crystallography
Axial Ratios:
a:b:c =1.0608:1:0.7198
Cell Dimensions:
a = 11.19, b = 10.548, c = 7.593, Z = 4; alpha = 100.38°, beta = 109.59°, gamma = 98.96° V = 820.39 Den(Calc)= 5.19
Crystal System:
Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io): 3.256(1)(022,212), 4.67(0.97)(211,021), 3.072(0.56)(211),2.568(0.46)(022,402,2322.89(0.4)(231,231), 1.731(0.38)
Crystal Structure:
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| | Effenberger H , Krause W , Bernhardt H J , Martin M , Mineralogical Magazine , 64 (2000) p.1109-1126, On the symmetry of tsumcorite group minerals based on the new species, rappoldite and zincgartrellite, Locality: Rappold mine, near Schneeberg, Saxony, Germany | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
Physical Properties of Rappoldite
Cleavage:
None
Color:
Red, Reddish brown.
Diaphaneity:
Translucent
Fracture:
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Habit:
Rosette - Bundled tabular aggregates resembling rose flower petals.
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
light yellow brown
Optical Properties of Rappoldite
Gladstone-Dale:
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1657,KC= 0.1647
Ncalc = 1.87
Optical Data:
Biaxial (+), a=1.85, b=1.87, g=1.9, bire=0.0500, 2V(Calc)=80, 2V(Meas)=85. Dispersion r > v distinct.
Calculated Properties of Rappoldite
Electron Density:
Bulk Density (Electron Density)=4.73 gm/cc
note: Specific Gravity of Rappoldite =5.27 gm/cc.
Fermion Index:
Fermion Index = 0.07
Boson Index = 0.93
Photoelectric:
PERappoldite = 577.36 barns/electron
U=PERappoldite x rElectron Density=2,730.65 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rappoldite is Not Radioactive
Rappoldite Classification
Dana Class:
40.02.09.05 (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.20 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.20 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri
08.CG.20 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1
08.CG.20 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1
08.CG.20 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1
08.CG.20 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1
08.CG.20 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1
Other Rappoldite Information
References:
NAME( AmMin, v 86, p 940) PHYS. PROP.(AmMin, v 86, p 940) OPTIC PROP.(AmMin, v 86, p 940)
See Also:
Links to other databases for Rappoldite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Rappoldite
Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O)
Dana No: 40.02.09.05 Strunz No: 08.CG.20
Locality:
Notes: