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Rappoldite Mineral Data
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General Rappoldite Information
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 Chemical Formula: |
Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) |
| Composition: |
Molecular Weight = 641.37 gm |
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Zinc 4.08 % Zn 5.08 % ZnO |
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Cobalt 9.19 % Co 11.68 % CoO |
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Nickel 5.49 % Ni 6.99 % NiO |
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Arsenic 23.36 % As 35.84 % As2O5 |
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Hydrogen 0.63 % H 5.62 % H2O |
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Lead 32.31 % Pb 34.80 % PbO |
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Oxygen 24.95 % O |
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______ ______ |
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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 |
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Rappoldite Image |
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Images:
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Rappoldite Crystallography
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| 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 - Pinacoidal H-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) |
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Physical Properties of Rappoldite
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| 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 |
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Optical Properties of Rappoldite
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| 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. |
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Calculated Properties of Rappoldite
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| Electron Density: |
Bulk Density (Electron Density)=4.73 gm/cc
note: Specific Gravity of Rappoldite =5.27 gm/cc.
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| 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.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rappoldite is Not Radioactive |
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Rappoldite Classification
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| Dana Class: |
40.02.09.05 (40)Hydrated Phosphates, etc |
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(40.02)where A++ (B++)2 (XO4) � x(H2O) |
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(40.02.09)Helmutwinklerite Subgroup |
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40.02.09.01 Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m |
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40.02.09.02 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1 |
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40.02.09.03 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m |
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40.02.09.04 Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m |
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40.02.09.05 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1 |
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40.02.09.06 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m |
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40.02.09.07 Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m |
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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 |
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08.C - Phosphates without Additional Anions, with H2O |
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08.CG -With large and medium-sized cations, RO4:H2O = 1:1 |
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08.CG.20 Gartrellite Pb(Cu,Fe)2(AsO4,SO4)2(CO3,H2O)0.7 P1,P 1 Tri |
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08.CG.20 Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1 |
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08.CG.20 Phosphogartrellite! PbCuFe(PO4)2(OH,H2O)2 P1 1 |
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08.CG.20 Zincgartrellite! Pb(Zn,Fe,Cu)2(AsO4)2(OH,H2O)2 P1 1 |
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08.CG.20 Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1 |
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08.CG.20 Lukrahnite! Ca(Cu,Zn)(Fe,Zn)(AsO4)2(OH,H2O)2 P1 1 |
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Other Rappoldite Information
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| 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:
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