Chaidamuite Mineral Data

Chaidamuite Mineral Data

General Chaidamuite Information

Chemical Formula:

(Zn,Fe++)Fe+++(SO4)2(OH)·4(H2O)

Composition:

Molecular Weight = 402.43 gm

Zinc 16.25 % Zn 20.22 % ZnO

Iron 13.88 % Fe 19.84 % Fe₂O₃

Hydrogen 2.25 % H 20.14 % H₂O

Sulfur 15.94 % S 39.79 % SO₃

Oxygen 51.68 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

ZnFe³⁺(SO₄)₂(OH)·4(H₂O)

Environment:

Secondary mineral.

IMA Status:

Approved IMA 1986

Locality:

Xitieshan Pb-Zn mine, Chaidamu (Qaidam) basin, Qinghai, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Chaidamuite Image

Images:

Chaidamuite

Comments: Pale yellow earthy coatings of chaidamuite with brown limonite on friable matrix.
Location: Getchell Mine, Humboldt County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chaidamuite Crystallography

Axial Ratios:

a:b:c =1.0148:1:1.3455

Cell Dimensions:

a = 7.309, b = 7.202, c = 9.691, Z = 2; alpha = 89.643°, beta = 105.89°, gamma = 91.11° V = 490.53 Den(Calc)= 2.72

Crystal System:

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

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

By Intensity(I/I_o): 3.118(1), 3.09(0.95), 9.4(0.8),

Physical Properties of Chaidamuite

Cleavage:

[001] Perfect, [100] Perfect

Color:

Brown, Yellowish brown.

Density:

2.722

Diaphaniety:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Chaidamuite

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2402,KPDmeas= 0.24,KC= 0.2334

Optical Data:

Biaxial (+), a=1.632, b=1.64, g=1.688, bire=0.0560, 2V(Calc)=46, 2V(Meas)=44.

Pleochroism (x):

colorless or light yellow.

Pleochroism (y):

light yellow or light yellow.

Pleochroism (z):

brownish yellow or brownish yellow.

Calculated Properties of Chaidamuite

Electron Density:

r_electron=2.72 gm/cc
note: r_Chaidamuite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.01105
Boson Index = 0.98895

Photoelectric:

PE_Chaidamuite= 12.86 barns/electron
U=PE_Chaidamuite x r_electron= 34.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chaidamuite is Not Radioactive

Chaidamuite Classification

Dana Class:

31.9.7.2 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.9)where (A+ B++) (XO4) Zq·x(H2O)

(31.9.7)Dana Group

31.9.7.1 Guildite CuFe(SO4)2(OH)·4(H2O) P 2₁/m 2/m

31.9.7.2 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)·4(H2O) P1 1

Strunz Class:

VI/D.10-110 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium size

VI/D.10 - Copiapite group, Botryogen - Chaidamuite

VI/D.10-10 Botryogen MgFe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-20 Zincobotryogen (Zn,Mg,Mn)Fe(SO4)2(OH)·7(H2O) P 2₁/n 2/m

VI/D.10-30 Calciocopiapite CaFe4(SO4)6(OH)2·19(H2O) P1 1

VI/D.10-40 Magnesiocopiapite MgFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-50 Copiapite FeFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-60 Cuprocopiapite CuFe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-70 Zincocopiapite ZnFe4(SO4)6(OH)2·18(H2O) P1 1

VI/D.10-80 Aluminocopiapite Al2/3Fe4(SO4)6O(OH)2·20(H2O) P1 1

VI/D.10-90 Ferricopiapite Fe2/3Fe4(SO4)6(OH)2·20(H2O) P1 1

VI/D.10-100 Guildite CuFe(SO4)2(OH)·4(H2O) P 2₁/m 2/m

VI/D.10-110 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)·4(H2O) P1 1

Other Chaidamuite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p1493,1988) OPTIC PROP.(Am.Min.,Vol.73,p1493,1988)

See Also:

Links to other databases for Chaidamuite :
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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Chaidamuite

(Zn,Fe++)Fe+++(SO4)2(OH)·4(H2O)
Dana No: 31.9.7.2 Strunz No: VI/D.10-110
Locality:

Notes: