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Hemihedrite

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Formula:
Pb10Zn(CrO4)6(SiO4)2(OH)2
IMA formula is outdated; the mineral is OH-dominant.
Colour:
Bright orange to henna-brown to nearly black (TL).
Hardness:
3
Specific Gravity:
6.42
Crystal System:
Triclinic
Member of:
Name:
Named in allusion to its hemihedral morphology.
Hemihedrite-Iranite Series. The zinc analogue of Iranite.

A reinvestigation of type material showed that the original F determination was erroneous and the mineral is in fact clearly OH-dominant (Lafuente et al., 2017).


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Classification of HemihedriteHide

Approved
Approval Year:
1967
First Published:
1970
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

Physical Properties of HemihedriteHide

Colour:
Bright orange to henna-brown to nearly black (TL).
Streak:
Saffron yellow (Munsell 5Y 8/10)
Hardness:
Density:
6.42 g/cm3 (Measured)    

Optical Data of HemihedriteHide

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 HemihedriteHide

Formula:
Pb10Zn(CrO4)6(SiO4)2(OH)2

IMA formula is outdated; the mineral is OH-dominant.
IMA Formula:
Pb10Zn(CrO4)6(SiO4)2F2

Crystallography of HemihedriteHide

Crystal System:
Triclinic
Cell Parameters:
a = 9.49 Å, b = 11.44 Å, c = 10.84 Å
α = 120.5°, β = 92.1°, γ = 55.83°
Ratio:
a:b:c = 0.83 : 1 : 0.948
Unit Cell V:
786.38 ų (Calculated from Unit Cell)
Morphology:
Complex with many observed forms. Hemihedral.
Twinning:
Twins on (0-12), (0-10), (2-23).

Type Occurrence of HemihedriteHide

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

Synonyms of HemihedriteHide

Other Language Names for HemihedriteHide

Relationship of Hemihedrite to other SpeciesHide

Member of:
Other Members of this group:
IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.
RaygrantitePb10Zn(SO4)6(SiO4)2(OH)2Tric. 1 : P1
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Phoenicochroite22 photos of Hemihedrite associated with Phoenicochroite on mindat.org.
Vauquelinite6 photos of Hemihedrite associated with Vauquelinite on mindat.org.
Willemite3 photos of Hemihedrite associated with Willemite on mindat.org.
Cerussite2 photos of Hemihedrite associated with Cerussite on mindat.org.
Iranite1 photo of Hemihedrite associated with Iranite on mindat.org.
Wulfenite1 photo of Hemihedrite associated with Wulfenite on mindat.org.
Quartz1 photo of Hemihedrite associated with Quartz on mindat.org.
Mimetite1 photo of Hemihedrite associated with Mimetite on mindat.org.
Wickenburgite1 photo of Hemihedrite associated with Wickenburgite on mindat.org.
Boleite1 photo of Hemihedrite associated with Boleite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.FC.05VauquelinitePb2Cu(CrO4)(PO4)(OH)Mon. 2/m
7.FC.10FornacitePb2Cu(CrO4)(AsO4)(OH)Mon. 2/m : P21/b
7.FC.10MolybdofornacitePb2Cu(MoO4,CrO4)(AsO4,PO4)(OH)Mon.
7.FC.15IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.
7.FC.20CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
7.FC.20EmbreyitePb5(CrO4)2(PO4)2 · H2OMon.

Related Minerals - Dana Grouping (8th Ed.)Hide

36.1.1.1IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

27.2.1TarapacáiteK2(CrO4)Orth. mmm (2/m 2/m 2/m)
27.2.2LópeziteK2Cr2O7Tric. 1 : P1
27.2.3ChromatiteCaCr6+O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
27.2.4HashemiteBa(CrO4)Orth. mmm (2/m 2/m 2/m) : Pnma
27.2.5CrocoitePb(CrO4)Mon. 2/m : P21/b
27.2.6PhoenicochroitePb2(CrO4)OMon.
27.2.7SantanaitePb11(CrO4)O12Hex. 6 2 2 : P63 2 2
27.2.8IranitePb10Cu(CrO4)6(SiO4)2(OH)2Tric.

Other InformationHide

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 HemihedriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Williams, S.A., Anthony, J.W. (1967) Abstract of paper presented at the twelfth annual meeting: Hemihedrite. A new mineral from Arizona. The Canadian Mineralogist: 9: 310-310.
Mandarino, J.A., Kato, A. (1968) New mineral names. American Mineralogist: 53: 1421-1427.
Williams, S.A., Anthony, J.W. (1970) Hemihedrite, a new mineral from AZ. American Mineralogist: 55: 1088-1102.
McLean, W.J., Anthony, J.W. (1970) The crystal structure of hemihedrite. American Mineralogist: 55: 1103-1114.
Fleischer, M. (1973) New mineral names. American Mineralogist: 58: 560-562.
Cesbron, F., Williams, S.A. (1980) Iranite-hémihédrite, bellite, phoenicochroite, vauquelinite et fornacite: synthèse et nouvelles données. Bulletin de Minéralogie: 103: 469-477.
Frost, R.L. (2004) Raman microscopy of selected chromate minerals. Journal of Raman Spectroscopy: 35: 153-158.
Lafuente, B., Downs, R.T., Origlieri, M.T., Domanik, K.J., Gibbs, R.B., Rumsey, M.S. (2017) New data on hemihedrite from Arizona. Mineralogical Magazine: 81: 1021-1030.

Internet Links for HemihedriteHide

Localities for HemihedriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
South Africa
 
  • Mpumalanga Province
    • Nkangala District
      • Delmas
Atanasova, M., Cairncross, B. and Windisch, W.R. (2016) Microminerals of the Bushveld Complex, South Africa. Popular Geoscience Series 6, Council for Geoscience, Pretoria, South Africa, 435 pp
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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