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Hemihedrite

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Formula:
Pb10Zn(CrO4)6(SiO4)2(F,OH)2
System:
Triclinic
Colour:
Bright orange to ...
Hardness:
3
Member of:
Hemihedrite-Iranite Series. The zinc analogue of Iranite.

Classification of Hemihedrite

Approved 1967
7.FC.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
Dana 7th ed.:
36.1.1.2
36.1.1.2

36 : COMPOUND CHROMATES
1 : Miscellaneous
27.2.9

27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
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Type Occurrence of Hemihedrite

Year of Discovery:
1967
Geological Setting of Type Material:
Oxidized zone of lead-bearing veins that cut strongly brecciated Precambrian limestone intruded by an altered latite porphyry and Precambrian quartzite containing a diabase dike.

Physical Properties of Hemihedrite

Colour:
Bright orange to henna-brown to nearly black (TL).
Hardness (Mohs):
3

Crystallography of Hemihedrite

Crystal System:
Triclinic
Cell Parameters:
a = 9.49Å, b = 11.44Å, c = 10.84Å
α = 120.5°, β = 92.1°, γ = 55.83°
Ratio:
a:b:c = 0.83 : 1 : 0.948

Optical Data of Hemihedrite

Type:
Biaxial (+)
RI values:
nα = 2.105 nβ = 2.320 nγ = 2.650
2V:
Measured: 88° , Calculated: 88°
Max Birefringence:
δ = 0.545
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong

Chemical Properties of Hemihedrite

Formula:
Pb10Zn(CrO4)6(SiO4)2(F,OH)2
Essential elements:
All elements listed in formula:

Relationship of Hemihedrite to other Species

Series:
Forms a series with Iranite (see here)
Member of:
Other Members of Group:
IranitePb10Cu(CrO4)6(SiO4)2(OH)2
RaygrantitePb10Zn(SO4)6(SiO4)2(OH)2
7.FC.05VauquelinitePb2Cu(CrO4)(PO4)(OH)
7.FC.10FornacitePb2Cu(CrO4)(AsO4)(OH)
7.FC.10MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)
7.FC.15IranitePb10Cu(CrO4)6(SiO4)2(OH)2
7.FC.20CassedanneitePb5(CrO4)2(VO4)2 · H2O
7.FC.20EmbreyitePb5(CrO4)2(PO4)2 · H2O
27.2.1TarapacáiteK2[CrO4]
27.2.2LópeziteK2[Cr2O7]
27.2.3ChromatiteCa[CrO4]
27.2.4HashemiteBa(Cr,S)O4
27.2.5CrocoitePb(CrO4)
27.2.6PhoenicochroitePb2(CrO4)O
27.2.7SantanaitePb11(CrO4)O12
27.2.8IranitePb10Cu(CrO4)6(SiO4)2(OH)2
36.1.1.1IranitePb10Cu(CrO4)6(SiO4)2(OH)2

Other Names for Hemihedrite

Name in Other Languages:

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 Hemihedrite

Reference List:
American Mineralogist: 55: 1088-1102.

Williams, S.A. & J.W. Anthony (1970), Hemihedrite, a new mineral from AZ, American Mineralogist: 55: 1088-1102.

McLean, W.J. & J.W. Anthony (1970), The crystal structure of hemihedrite, American Mineralogist: 55: 1103-1114.

Internet Links for Hemihedrite

Localities for Hemihedrite

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.
Chile
 
  • Antofagasta Region
    • Tocopilla Province
      • Sierra Gorda district
        • Caracoles
Sample analysed by Tony Kampf of LAC Mineralogical Museum, USA
Iran
 
  • Esfahan Province (Isfahan Province; Aspadana Province)
    • Nain County (Nayin County)
      • Anarak District
USA
 
  • Arizona
    • Maricopa Co.
      • Belmont Mts
        • Wickenburg area
Mineralogy of Arizona, 3rd Edition, John W. Anthony et al, p247
      • Big Horn Mts
        • Osborn District
          • Hummingbird Spring
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 247.
          • Tonopah
            • Belmont Mountain
collected by and in the collection of Eckhard D. Stuart
      • Vulture Mts
        • Vulture District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 247; Williams, S.A. & J.W. Anthony (1970), Hemihedrite, a new mineral from AZ, Am.Min.: 55: 1088-1102; Williams, S.A., et al (1970), A study of phoenicochroite-Its structure and properties, Am.MIn.:: 55: 784-792; McLean, W.J. & J.W. Anthony (1970), The crystal structure of hemihedrite, Am.Min.: 55: 1103-1114.
    • Pinal Co.
      • Tortilla Mts
        • Ripsey District
          • Ripsey Hill area
Anthony, J.W., et al (1995), Mineralogy of Arizona (1995), 3rd.ed.: 158, 247, 413; Williams, S.A. & J.W. Anthony (1970), Hemihedrite, a new mineral from AZ, Am.Min.: 55: 1088-1102; Clark, 1993, "Hey's Mineral Index".
    • Yavapai Co.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 247.
      • Bradshaw Mts (Bradshaw Range)
        • Castle Creek District
          • Copperopolis
Rolf Luetcke
  • Nevada
    • Clark Co.
      • Eldorado Mts
        • Eldorado District (Colorado District)
NBMG Spec. Pub. 31 Minerals of Nevada; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
      • Spring Mts
        • Goodsprings District
NBMG Spec. Pub. 31 Minerals of Nevada
Southern California Micromounters Symposium 29 Jan 2010, Redlands, CA
Mineral and/or Locality  
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