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Chaidamuite

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Formula:
ZnFe3+(SO4)2(OH) · 4H2O
System:
Triclinic
Colour:
Brown to yellowish-brown
Hardness:
2½ - 3
Name:
From the type locality.
This page provides mineralogical data about Chaidamuite.

Classification of Chaidamuite

Approved 1985
7.DC.30

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
C : With only medium-sized cations; chains of edge-sharing octahedra
31.9.7.2

31 : HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
9 : (AB)(XO4)Zq·xH2O
25.5.12

25 : Sulphates
5 : Sulphates of Zn and Hg
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First Recorded Occurrence of Chaidamuite

Place of Conservation of First Recorded Material:
Geology and Mineralogy Resources Museum of Ministry of Geology, Beijing, China.
Geological Setting of First Recorded Material:
Oxidized zone of galena-sphalerite-pyrite deposit

Physical Properties of Chaidamuite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Brown to yellowish-brown
Streak:
Pale yellow
Hardness (Mohs):
2½ - 3
Cleavage:
Perfect
(100) (001)
Fracture:
Conchoidal
Density:
2.722(2) g/cm3 (Measured)    2.72 g/cm3 (Calculated)

Crystallography of Chaidamuite

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 7.309(2) Å, b = 7.202(2) Å, c = 9.691(3) Å
α = 89.64(3)°, β = 105.89(1)°, γ = 91.11(1)°
Ratio:
a:b:c = 1.015 : 1 : 1.346
Z:
2
Morphology:
Thick tabular to pseudocubic crystals, grains and granular aggregates.

Optical Data of Chaidamuite

Type:
Biaxial (+)
RI values:
nα = 1.632 nβ = 1.640 nγ = 1.688
2V:
Measured: 44° , Calculated: 46°
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong r < v
Pleochroism:
Strong
Comments:
X= pale yellow, colorless
Y= pale yellow
z= Brownish yellow

Chemical Properties of Chaidamuite

Formula:
ZnFe3+(SO4)2(OH) · 4H2O
Essential elements:
All elements listed in formula:
Empirical Formula:
ZnFe3+(SO4)2(OH) · 4H2O

Relationship of Chaidamuite to other Species

7.DC.05AluminiteAl2(SO4)(OH)4 · 7H2O
7.DC.05Meta-aluminiteAl2(SO4)(OH)4 · 5H2O
7.DC.10ButleriteFe3+(SO4)(OH) · 2H2O
7.DC.10ParabutleriteFe3+(SO4)(OH) · 2H2O
7.DC.15FibroferriteFe3+(SO4)(OH) · 5H2O
7.DC.20XitieshaniteFe3+(SO4)Cl · 6H2O
7.DC.25BotryogenMgFe3+(SO4)2(OH) · 7H2O
7.DC.25Zincobotryogen(Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O
7.DC.30GuilditeCuFe3+(SO4)2(OH) · 4H2O
25.5.1ZinkositeZnSO4
25.5.2GoslariteZnSO4 · 7H2O
25.5.3Namuwite(Zn,Cu)4(SO4)(OH)6 · 4H2O
25.5.4KtenasiteZn(Cu,Zn)4(SO4)2(OH)6 · 6H2O
25.5.5Ramsbeckite(Cu,Zn)15(SO4)4(OH)22 · 6H2O
25.5.6Boyleite(Zn,Mg)SO4 · 4H2O
25.5.7SerpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
25.5.8OrthoserpieriteCa(Cu,Zn)4(SO4)2(OH)6 · 3H2O
25.5.9ZincaluminiteZn6Al6(SO4)2(OH)16 · 5H2O
25.5.10Glaucocerinite(Zn1-xAlx)(OH)2(SO4)x/2 · nH2O
25.5.11GunningiteZnSO4 · H2O
25.5.13Bianchite(Zn,Fe)SO4 · 6H2O
25.5.15Zincmelanterite(Zn,Cu,Fe)SO4 · 7H2O
25.5.16Zincobotryogen(Zn,Mg,Mn2+)Fe3+(SO4)2(OH) · 7H2O
25.5.17SchuetteiteHg32+(SO4)O2
25.5.18Gianellaite(Hg2N)2SO4

Other Names for Chaidamuite

Name in Other Languages:
German:Chaidamuit
Spanish:Chaidamuita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chaidamuite

Reference List:
Li Wanmao, Chen Guoying, and Peng Zhizhong (1986): Chaidamuite - A new zinc and ferric sulfate mineral. Acta Mineralogica Sinica 6(2), 109-13 (in Chinese, English abstract). - American Mineralogist (1987), 73, 1493 (abstract); American Mineralogist (1989), 75, 1436 (abstract).

Li Wanmao and Q. Wang (1990): Determination and refinement of the crystal structure of chaidamuite. Sci. China, Ser. B 33, 623-630.

Internet Links for Chaidamuite

Localities for Chaidamuite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
China
 
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • Da Qaidam Co. (Dachaidan Co.)
        • Xitieshan
Wanmao Li, Guoying Chen, and Zhizhong Peng (1986): Acta Mineralogica Sinica 6(2), 109-114
USA
 
  • Nevada
    • Humboldt Co.
      • Osgood Mts
        • Potosi District
          • Adam Peak
NBMG Spec. Pub. 31 Minerals of Nevada
Mineral and/or Locality  
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