Richelsdorfite Mineral Data

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General Richelsdorfite Information

Chemical Formula:

Ca2Cu5Sb(AsO4)4Cl(OH)6•6(H2O)

Composition:

Molecular Weight = 1,320.90 gm

Calcium 6.07 % Ca 8.49 % CaO

Copper 24.05 % Cu 27.08 % Cu₂O

Antimony 9.22 % Sb 11.03 % Sb₂O₃

Arsenic 22.69 % As 34.80 % As₂O₅

Hydrogen 1.37 % H 12.27 % H₂O

Chlorine 2.68 % Cl 2.68 % Cl

- % Cl -0.61 % -O=Cl₂

Oxygen 33.91 % O

______ ______

100.00 % 95.76 % = TOTAL OXIDE

Empirical Formula:

Ca₂Cu₅Sb(AsO₄)₄Cl(OH)₆•6(H₂O)

Environment:

Found in Permian-aged sandstone at the type locality.

IMA Status:

Approved IMA 1983

Locality:

Richelsdorf Mountains, Hesse, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Richelsdorfite + Pronunciation

Synonym:

ICSD 62339

PDF 46-1462

Richelsdorfite Image

Images:

Richelsdorfite

Comments: Greenish rounded aggregates of richelsdorfite on matrix.
Location: Wilhelm Mine; Wechselschacht, near Bauhaus, Richelsdorf District, Hesse, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Richelsdorfite Crystallography

Axial Ratios:

a:b:c =0.9909:1:0.9495

Cell Dimensions:

a = 14.078, b = 14.207, c = 13.49, Z = 4; beta = 101.06° V = 2,647.97 Den(Calc)= 3.31

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): 13.29(1), 3.132(0.9), 2.776(0.35),

Crystal Structure:

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Susse P , Tillmann B , Zeitschrift fur Kristallographie , 179 (1987) p.323-334, The crystal structure of the new mineral richelsdorfite,, Ca2Cu5Sb(Cl/(OH)6/(AsO4)4)*6H2O, Locality: Iba, near Richelsdorf, Hessen, Germany

Physical Properties of Richelsdorfite

Cleavage:

{001} Perfect

Color:

Sky blue, Turquoise.

Density:

3.2 - 3.3, Average = 3.25

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

greenish blue

Optical Properties of Richelsdorfite

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.204,KPDmeas= 0.2078,KC= 0.2102
Ncalc = 1.67 - 1.7

Optical Data:

Biaxial (-), a=1.64, b=1.692, g=1.694, bire=0.0540, 2V(Calc)=20, 2V(Meas)=10-15.

Calculated Properties of Richelsdorfite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Richelsdorfite =3.25 gm/cc.

Fermion Index:

Fermion Index = 0.0002467739
Boson Index = 0.9997532261

Photoelectric:

PE_{Richelsdorfite}= 55.70 barns/electron
U=PE_{Richelsdorfite} x rElectron Density= 171.86 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Richelsdorfite is Not Radioactive

Richelsdorfite Classification

Dana Class:

42.07.15.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq · x(H2O)

(42.07.15)Richelsdorfite Group

42.07.15.01 Richelsdorfite Ca2Cu5Sb(AsO4)4Cl(OH)6•6(H2O) C 2/m 2/m

42.07.15.02 Bleasdaleite! (Ca,Fe)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 C 2/m 2/m

Strunz Class:

08.DK.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DK -With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1

08.DK.25 Richelsdorfite Ca2Cu5Sb(AsO4)4Cl(OH)6•6(H2O) C 2/m 2/m

08.DK.25 Bleasdaleite! (Ca,Fe)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13 C 2/m 2/m

Other Richelsdorfite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Richelsdorfite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Richelsdorfite

Ca2Cu5Sb(AsO4)4Cl(OH)6•6(H2O)
Dana No: 42.07.15.01 Strunz No: 08.DK.25
Locality:

Notes: