Mineralogy Database

Hemihedrite Mineral Data

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General Hemihedrite Information

Help on Chemical  Formula: Chemical Formula: Pb10Zn(CrO4)6(SiO4)2F2
Help on Composition: Composition: Molecular Weight = 3,055.52 gm
   Zinc       2.14 %  Zn    2.66 % ZnO
   Chromium  10.21 %  Cr   19.64 % CrO3
   Silicon    1.84 %  Si    3.93 % SiO2
   Lead      67.81 %  Pb   73.05 % PbO
   Oxygen    16.76 %  O
   Fluorine   1.24 %  F     1.24 % F
               -   %   F    -0.52 % -O=F2    
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb10Zn(CrO4)6(SiO4)2F2
Help on Environment: Environment: Secondary lead mineral from oxidized primary minerals.
Help on IMA Status: IMA Status: Approved IMA 1967
Help on Locality: Locality: Florence mine, Pinal County and Pack Rat claim, Whickenburg, Maricopa County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its hemihedral crystal morphology.
Help on Name Pronunciation: Name Pronunciation: Hemihedrite + Pronunciation Say HEMIHEDRITE
Help on Synonym: Synonym: ICSD 15175
  PDF 24-1457

Hemihedrite Image

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Comments: Reddish brown crystals of hemihedrite on matrix.
Location: Florence Pb-Ag mine, Whckenburg, Maricopa County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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  Hemihedrite   Phoenicochroite

Comments: Yellow hemihedrite crystals to 1 mm within pockets of dark red phoenicochroite crystalline aggregates on matrix.
Location: Pack Rat claim, Maricopa Co., Arizona, USA. Scale: Picture size 1.5 cm.
© Tom Loomis / Dakota Matrix

Hemihedrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8299:1:0.9473
Help on Cell Dimensions: Cell Dimensions: a = 9.497, b = 11.443, c = 10.841, Z = 1; alpha = 120.5°, beta = 92.1°, gamma = 55.84° V = 839.42 Den(Calc)= 6.04
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.302(1), 3.11(0.69), 3.163(0.69),

Physical Properties of Hemihedrite

Help on Color: Color: Orange, Brown, Black.
Help on Density: Density: 6.42
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: saffron

Optical Properties of Hemihedrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.203 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.199 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2109,KPDmeas= 0.2116,KC= 0.1759
Ncalc = 2.13
Help on Optical Data: Optical Data: Biaxial (+), a=2.105, b=2.32, g=2.65, bire=0.5450, 2V(Calc)=88, 2V(Meas)=88. Dispersion strong.

Calculated Properties of Hemihedrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.46 gm/cc
note: Specific Gravity of Hemihedrite =6.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEHemihedrite =1,231.05 barns/electron
U=PEHemihedrite x rElectron Density=6,725.33 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hemihedrite is Not Radioactive

Hemihedrite Classification

Help on  Dana Class: Dana Class: (36)Compound Chromates
  (36.01)with miscellaneous formulae
  (36.01.01)Dana Group Iranite Pb10Cu(CrO4)6(SiO4)2(F,OH)2 P1 1 Hemihedrite Pb10Zn(CrO4)6(SiO4)2F2 P1 1
Help on  Strunz Class: Strunz Class: 07.FC.15 07 - SULFATES (SELENATES, TELLURATES)
  07.F - Chromates
  07.FC -With PO4, AsO4, SiO4
07.FC.15 Hemihedrite Pb10Zn(CrO4)6(SiO4)2F2 P1 1
07.FC.15 Iranite Pb10Cu(CrO4)6(SiO4)2(F,OH)2 P1 1

Other Hemihedrite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Hemihedrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 07.FC.15





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