Rappoldite Mineral Data

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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:

PbCoNi_0.6Zn_0.4(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

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

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

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

By Intensity(I/I_o): 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:

PE_Rappoldite= 577.36 barns/electron
U=PE_Rappoldite 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: