Hemihedrite (original) (raw)
A valid IMA mineral species
About HemihedriteHide
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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IMA formula is outdated; the mineral is OH-dominant.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).
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).
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1859:9
2e1fd5e8-a904-4673-a5d3-af90f900bc59
IMA Classification of HemihedriteHide
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IMA Formula:
ZnPb10(CrO4)6(SiO4)2(OH)2
Type description reference:
Classification of HemihedriteHide
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7.FC.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
C : With PO4, AsO4, SiO4
36.1.1.2
36 : COMPOUND CHROMATES
1 : Miscellaneous
27.2.9
27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Hhe | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of HemihedriteHide
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Transparency:
Transparent, Translucent
Colour:
Bright orange to henna-brown to nearly black (TL).
Streak:
Saffron yellow (Munsell 5Y 8/10)
Density:
6.42 g/cm3 (Measured) 6.50 g/cm3 (Calculated)
Optical Data of HemihedriteHide
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RI values:
_n_α = 2.105(5) _n_β = 2.320(2) _n_γ = 2.650(2)
2V:
Measured: 92° , Calculated: 88°
δ = 0.545
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
yellow to orange
Chemistry of HemihedriteHide
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Mindat Formula:
Pb10Zn(CrO4)6(SiO4)2(OH)2
IMA formula is outdated; the mineral is OH-dominant.
Crystallography of HemihedriteHide
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Cell Parameters:
a = 9.497(1) Å, b = 11.443(2) Å, c = 10.841(2) Å
α = 120.5°, β = 92.1°, γ = 55.83°
Ratio:
a:b:c = 0.83 : 1 : 0.947
Unit Cell V:
787.24 ų (Calculated from Unit Cell)
Morphology:
Complex with many observed forms. Hemihedral.
Twinning:
Twins on (012), (010), (223).
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0000205 | Hemihedrite | McLean W J, Anthony J W (1970) The crystal structure of hemihedrite American Mineralogist 55 1103-1114 |  |
1970 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.301 Å | (100) |
| 4.872 Å | (90) |
| 4.364 Å | (80) |
| 3.164 Å | (80) |
| 3.102 Å | (80) |
| 2.924 Å | (55) |
| 2.849 Å | (45) |
Geological EnvironmentHide
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Type Occurrence of HemihedriteHide
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Place of Conservation of Type Material:
The Natural History Museum, London, England, 1968,246; University of Arizona, Tucson, Arizona; National Museum of Natural History, Washington, D.C., USA, 141026
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.
Associated Minerals at Type Locality:
Reference:
Williams, S.A., Anthony, J.W. (1970) Hemihedrite, a new mineral from AZ. American Mineralogist: 55: 1088-1102.
Synonyms of HemihedriteHide
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Other Language Names for HemihedriteHide
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Relationship of Hemihedrite to other SpeciesHide
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Other Members of this group:
| Iranite | Pb10Cu(CrO4)6(SiO4)2(OH)2 | Tric. 1 : _P_1 |
|---|---|---|
| Raygrantite | Pb10Zn(SO4)6(SiO4)2(OH)2 | Tric. 1 : _P_1 |
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for HemihedriteHide
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References for HemihedriteHide
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Reference List:
Localities for HemihedriteHide
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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
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.