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Hemihedrite

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Big Photo

Rat Tail claim (Pack Rat claim), Wickenburg area, Belmont Mts, Maricopa Co., Arizona, USA
© Brent Thorne

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


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
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)
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

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  • Raman and XRD data at RRUFF project
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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.
    Hide Locality List
    (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.
        • 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 District
    		NBMG Spec. Pub. 31 Minerals of Nevada
        • Goodsprings District
    		NBMG Spec. Pub. 31 Minerals of Nevada
    Southern California Micromounters Symposium 29 Jan 2010, Redlands, CA
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