Chudobaite Mineral Data

Chudobaite Mineral Data

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General Chudobaite Information

Chemical Formula:

(Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O)

Composition:

Molecular Weight = 953.87 gm

Magnesium 6.88 % Mg 11.41 % MgO

Zinc 15.77 % Zn 19.62 % ZnO

Arsenic 31.42 % As 48.19 % As₂O₅

Hydrogen 2.32 % H 20.78 % H₂O

Oxygen 43.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_2.7Zn_2.3(AsO₄)₂(AsO₃OH)₂·10(H₂O)

Environment:

Deep oxidation zone of a dolostone-hosted hydrothermal polymetallic ore deposit.

IMA Status:

Approved IMA 1960

Locality:

Tsumeb, Namibia. Link to MinDat.org Location Data.

Name Origin:

Name for Karl Franz Chudoba (1898-1915), Professor of Mineralogy, University of Bonn, Germany.

Synonym:

ICSD 267

PDF 12-643

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Chudobaite Crystallography

Axial Ratios:

a:b:c =0.743:1:0.6332

Cell Dimensions:

a = 7.944, b = 10.691, c = 6.77, Z = 1; alpha = 80.97°, beta = 84.2°, gamma = 81.85° V = 559.23 Den(Calc)= 2.83

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 10.163(1), 2.979(0.9), 3.44(0.8),

Physical Properties of Chudobaite

Cleavage:

[010] Very Good, [100] Good

Color:

Pink, Rose, White, Colorless.

Density:

2.94

Diaphaniety:

Transparent

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chudobaite

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2068,KC= 0.2025

Optical Data:

Biaxial (-), a=1.583, b=1.608, g=1.633, bire=0.0500, 2V(Calc)=88, 2V(Meas)=79.

Calculated Properties of Chudobaite

Electron Density:

r_electron=2.86 gm/cc
note: r_Chudobaite=2.94 gm/cc.

Fermion Index

Fermion Index = 0.01355
Boson Index = 0.98645

Photoelectric:

PE_Chudobaite= 28.92 barns/electron
U=PE_Chudobaite x r_electron= 82.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chudobaite is Not Radioactive

Chudobaite Classification

Dana Class:

39.2.6.1 (39)Hydrated Acid Phosphates, etc

(39.2)H2 (AB)5 (XO4)4 · x(H2O)

(39.2.6)Dana Group

39.2.6.1 Chudobaite (Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O) P1 1

39.2.6.2 Geigerite Mn5(AsO3OH)2(AsO4)2·10(H2O) P1 1

Strunz Class:

VII/C.06-40 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.06 - Cobaltkoritnigite - Geigerite series

VII/C.06-10 Cobaltkoritnigite (Co,Zn)(AsO3OH)·(H2O) P1 1

VII/C.06-20 Koritnigite ZnHAsO4·(H2O) P1 1

VII/C.06-30 Geminite Cu2As2O7·3(H2O) P1 or P1 Tri

VII/C.06-32 Pushcharovskite! Cu(AsO3OH)·1.5(H2O) P1 or P1 Tri

VII/C.06-35 Yvonite! Cu(AsO3OH)·2(H2O) P1 1

VII/C.06-37 Rollandite! Cu3(AsO4)2·4(H2O) P nma 2/m 2/m 2/m

VII/C.06-40 Chudobaite (Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O) P1 1

VII/C.06-50 Lindackerite CuCu4(AsO4)2(AsO3OH)2·~9(H2O) P1 1

VII/C.06-60 Geigerite Mn5(AsO3OH)2(AsO4)2·10(H2O) P1 1

Other Chudobaite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chudobaite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Chudobaite

(Mg,Zn)5(AsO3OH)2(AsO4)2·10(H2O)
Dana No: 39.2.6.1 Strunz No: VII/C.06-40
Locality:

Notes: