Mineralogy Database

Chaidamuite Mineral Data

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General Chaidamuite Information

Help on Chemical  Formula: Chemical Formula: (Zn,Fe++)Fe+++(SO4)2(OH)•4(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: ZnFe3+(SO4)2(OH)•4(H2O)
Help on Environment: Environment: Secondary mineral.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Xitieshan Pb-Zn mine, Chaidamu (Qaidam) basin, Qinghai, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.

Chaidamuite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0148:1:1.3455
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.118(1), 3.09(0.95), 9.4(0.8),

Physical Properties of Chaidamuite

Help on Cleavage: Cleavage: {001} Perfect, {100} Perfect
Help on Color: Color: Brown, Yellowish brown.
Help on Density: Density: 2.722
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow

Optical Properties of Chaidamuite

Help on Gladstone-Dale: 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
Ncalc = 1.63 - 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.632, b=1.64, g=1.688, bire=0.0560, 2V(Calc)=46, 2V(Meas)=44.
Help on Pleochroism (x): Pleochroism (x): colorless or light yellow.
Help on Pleochroism (y): Pleochroism (y): light yellow or light yellow.
Help on Pleochroism (z): Pleochroism (z): brownish yellow or brownish yellow.

Calculated Properties of Chaidamuite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Chaidamuite =2.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChaidamuite = 12.86 barns/electron
U=PEChaidamuite x rElectron Density= 34.96 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chaidamuite is Not Radioactive

Chaidamuite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.09)where (A+ B++) (XO4) Zq�x(H2O)
  (31.09.07)Dana Group Guildite CuFe(SO4)2(OH)•4(H2O) P 21/m 2/m Chaidamuite (Zn,Fe)Fe(SO4)2(OH)•4(H2O) P1 1
Help on  Strunz Class: Strunz Class: 07.DC.30 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DC -With only medium-sized cations; chains of corner-sharing octahedra
07.DC.30 Chaidamuite (Zn,Fe)Fe(SO4)2(OH)•4(H2O) P1 1
07.DC.30 Guildite CuFe(SO4)2(OH)•4(H2O) P 21/m 2/m

Other Chaidamuite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.73,p1493,1988) OPTIC PROP.(Am.Min.,Vol.73,p1493,1988)
Help on See Also: See Also: Links to other databases for Chaidamuite :
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

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Dana No: Strunz No: 07.DC.30





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