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Rappoldite Mineral Data

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General Rappoldite Information

Help on Chemical  Formula: Chemical Formula: Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: PbCoNi0.6Zn0.4(AsO4)2•2(H2O)
Help on Environment: Environment: Co-dominant analogue of helmutwinklerite associated with cobaltlotharmeyerite as overgrowths on quartz.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Dump material from the Rappold mine near Schneeberg, Saxony, Germay. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Synonym: Synonym: IMA1998-015

Rappoldite Image

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Comments: Small brown crystals of rappoldite.
Location: Rappold, Schneeberg, Erzgebirge, Germany. Scale: Box Size 1.25 x 1.25 inches.
© Sonke Stolze / Systematic Minerals

Rappoldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0608:1:0.7198
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: 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)

Physical Properties of Rappoldite

Help on Cleavage: Cleavage: None
Help on Color: Color: Red, Reddish brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow brown

Optical Properties of Rappoldite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1657,KC= 0.1647
Ncalc = 1.87
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.73 gm/cc
note: Specific Gravity of Rappoldite =5.27 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PERappoldite = 577.36 barns/electron
U=PERappoldite x rElectron Density=2,730.65 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rappoldite is Not Radioactive

Rappoldite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.02)where A++ (B++)2 (XO4) � x(H2O)
  (40.02.09)Helmutwinklerite Subgroup Tsumcorite PbZnFe(AsO4)2•(H2O) C 2/m 2/m Helmutwinklerite PbZn2(AsO4)2•2(H2O) P1 1 Thometzekite Pb(Cu,Zn)2(AsO4)2•2(H2O) C 2/m 2/m Mawbyite Pb(FeZn)2(AsO4)2(OH,H2O)2 C 2/m 2/m Rappoldite! Pb(Co,Ni,Zn,)2(AsO4)2•2(H2O) P1 1 Schneebergite! Bi(Co,Ni)2(AsO4)2(OH,H2O)2 C 2/m 2/m Nickelschneebergite! Bi(Ni,Co)2(AsO4)2(OH,H2O)2 C 2/m 2/m Cobalttsumcorite! Pb(Co,Fe)2(AsO4)2(OH,H2O)2 C 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v 86, p 940) PHYS. PROP.(AmMin, v 86, p 940) OPTIC PROP.(AmMin, v 86, p 940)
Help on See Also: 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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Dana No: Strunz No: 08.CG.20





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