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Hemihedrite

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Formula:
Pb
 
10
Zn(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
System:TriclinicColour:Bright orange to ...
Hardness:3
Member of:Iranite Group


Hemihedrite-Iranite Series. The zinc analogue of Iranite.

Classification of Hemihedrite

IMA status:Approved 1967
Strunz 8th edition ID:8/B.28-20
Nickel-Strunz 10th (pending) edition ID:7.FC.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
Dana 7th edition ID:36.1.1.2
Dana 8th edition ID:36.1.1.2

36 : COMPOUND CHROMATES
1 : Miscellaneous
Hey's CIM Ref.:27.2.9

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

Type Locality:Florence Mine (Florence Lead Silver Mine), Ripsey Hill area, Ripsey District, Tortilla Mts, Pinal Co., Arizona, USA
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
Unit Cell Volume:V 786.38 ų (Calculated from Unit Cell)

Optical Data of Hemihedrite

Type:Biaxial (+)
RI values: nα = 2.105 nβ = 2.320 nγ = 2.650
2V:Measured: 88° , Calculated: 88°
Maximum Birefringence:δ = 0.545

Chart 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:
Pb
 
10
Zn(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
Simplified for copy/paste:Pb10Zn(CrO4)6(SiO4)2(F,OH)2
Essential elements:Cr, F, O, Pb, Si, Zn
All elements listed in formula:Cr, F, H, O, Pb, Si, Zn

Relationship of Hemihedrite to other Species

Series:Forms a series with Iranite (see here)
Member of:Iranite Group
Other Members of Group:

- +
Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
Raygrantite
Pb
 
10
Zn(SO
 
4
)
 
6
(SiO
 
4
)
 
2
(OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
7.FC.05Vauquelinite
Pb
 
2
Cu(CrO
 
4
)(PO
 
4
)(OH)
7.FC.10Fornacite
Pb
 
2
Cu(CrO
 
4
)(AsO
 
4
)(OH)
7.FC.10Molybdofornacite
Pb
 
2
Cu(MoO
 
4
,CrO
 
4
)(AsO
 
4
,PO
 
4
)(OH)
7.FC.15Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
7.FC.20Cassedanneite
Pb
 
5
(CrO
 
4
)
 
2
(VO
 
4
)
 
2
· H
 
2
O
7.FC.20Embreyite
Pb
 
5
(CrO
 
4
)
 
2
(PO
 
4
)
 
2
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
27.2.1Tarapacáite
K
 
2
[CrO
 
4
]
27.2.2Lópezite
K
 
2
[Cr
 
2
O
 
7
]
27.2.3Chromatite
Ca[CrO
 
4
]
27.2.4Hashemite
Ba(Cr,S)O
 
4
27.2.5Crocoite
Pb(CrO
 
4
)
27.2.6Phoenicochroite
Pb
 
2
(CrO
 
4
)O
27.2.7Santanaite
Pb
 
11
(CrO
 
4
)O
 
12
27.2.8Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
Related Minerals - Dana Grouping):

- +
36.1.1.1Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2

Other Names for Hemihedrite

Synonyms:
IMA1967-011
Other Languages:
German:Hemihedrit
Russian:Гемиэдрит
Spanish:Hemihedrita

Other Information

Health Warning: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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Hemihedrite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Hemihedrite

    The 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. ? 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
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