SUPPORT US. If is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About HemihedriteHide

IMA formula is outdated; the mineral is OH-dominant.
Bright orange to henna-brown to nearly black (TL).
Specific Gravity:
Crystal System:
Member of:
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).

Classification of HemihedriteHide

Approval Year:
First Published:

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

1 : Miscellaneous

27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates

Physical Properties of HemihedriteHide

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

Optical Data of HemihedriteHide

Biaxial (+)
RI values:
nα = 2.105 nβ = 2.320 nγ = 2.650
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

Chemical Properties of HemihedriteHide


IMA formula is outdated; the mineral is OH-dominant.
IMA Formula:

Crystallography of HemihedriteHide

Crystal System:
Cell Parameters:
a = 9.49 Å, b = 11.44 Å, c = 10.84 Å
α = 120.5°, β = 92.1°, γ = 55.83°
a:b:c = 0.83 : 1 : 0.948
Unit Cell V:
786.38 ų (Calculated from Unit Cell)
Complex with many observed forms. Hemihedral.
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.
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:
RaygrantitePb10Zn(SO4)6(SiO4)2(OH)2Tric. 1 : P1
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
22 photos of Hemihedrite associated with PhoenicochroitePb2(CrO4)O
6 photos of Hemihedrite associated with VauquelinitePb2Cu(CrO4)(PO4)(OH)
3 photos of Hemihedrite associated with WillemiteZn2SiO4
2 photos of Hemihedrite associated with CerussitePbCO3
1 photo of Hemihedrite associated with IranitePb10Cu(CrO4)6(SiO4)2(OH)2
1 photo of Hemihedrite associated with WulfenitePb(MoO4)
1 photo of Hemihedrite associated with QuartzSiO2
1 photo of Hemihedrite associated with MimetitePb5(AsO4)3Cl
1 photo of Hemihedrite associated with WickenburgiteCaPb3Al2Si10O24(OH)6
1 photo of Hemihedrite associated with BoleiteKPb26Ag9Cu24(OH)48Cl62

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.20CassedanneitePb5(CrO4)2(VO4)2 · H2OMon.
7.FC.20EmbreyitePb5(CrO4)2(PO4)2 · H2OMon. 2/m : B2/m

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

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
27.2.4HashemiteBaCrO4Orth. mmm (2/m 2/m 2/m) : Pnma
27.2.5CrocoitePbCrO4Mon. 2/m : P21/b
27.2.7SantanaitePb11(CrO4)O12Hex. 6 2 2 : P63 2 2

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.
  • Antofagasta
    • Tocopilla Province
      • Caracoles
Sample analysed by Tony Kampf of LAC Mineralogical Museum, USA
  • Isfahan
    • Nain County (Nayin County)
      • Anarak District
South Africa
  • Mpumalanga
    • 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
  • Arizona
    • Maricopa Co.
      • Belmont Mts
        • Wickenburg area
Mineralogy of Arizona, 3rd Edition, John W. Anthony et al, p247
      • Osborn Mining 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 Mining 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 Mining 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 Mining District
          • Copperopolis
Rolf Luetcke
  • Nevada
    • Clark Co.
      • Eldorado Mts
        • Eldorado Mining District (Colorado Mining 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 Mining District
NBMG Spec. Pub. 31 Minerals of Nevada
Southern California Micromounters Symposium 29 Jan 2010, Redlands, CA
Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 15, 2019 15:07:53 Page generated: October 14, 2019 12:18:39
Go to top of page