Mineralogy Database

Pinchite Mineral Data

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General Pinchite Information

Help on Chemical  Formula: Chemical Formula: Hg++5O4Cl2
Help on Composition: Composition: Molecular Weight = 1,137.85 gm
   Mercury   88.14 %  Hg   95.17 % HgO
   Chlorine   6.23 %  Cl    6.23 % Cl
               -   %   Cl   -1.41 % -O=Cl2   
   Oxygen     5.62 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Hg5O4Cl2
Help on Environment: Environment: Secondary mineral in a hydrothermal mercury deposit.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: Terlingua, Brewster Co., Texas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for William Wallace Pinch (1940- ), American mineral collector of Rochester, New York, USA, who first noted the species.
Help on Name Pronunciation: Name Pronunciation: Pinchite Say PINCHITE
Help on Synonym: Synonym: ICSD 75935
  PDF 26-1267

Pinchite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  Pinchite   Montroydite

Comments: Minute lustrous black pinchite crystals on white montroydite.
Location: Terlingua, Brewster County, Texas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pinchite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.9031:1:1.918
Help on Cell Dimensions: Cell Dimensions: a = 11.619, b = 6.105, c = 11.71, Z = 4; V = 830.64 Den(Calc)= 9.10
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: I bam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.837(1), 2.695(0.8), 3.94(0.6),

Physical Properties of Pinchite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black, Black brown.
Help on Density: Density: 9.5
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Streak: Streak: reddish brown

Optical Properties of Pinchite

Help on Optical Data: Optical Data: NCalc= 2.24 - from Gladstone-Dale relationship (KC = 0.1368) where Ncalc=Dcalc*KC+1
NCalc= 2.3 - from Gladstone-Dale relationship (KC = 0.1368) where Ncalc=Dmeas*KC+1

Calculated Properties of Pinchite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=7.45 gm/cc
note: Specific Gravity of Pinchite =9.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.26
Boson Index = 0.74
Help on Photoelectric: Photoelectric: PEPinchite =1,523.65 barns/electron
U=PEPinchite x rElectron Density=11356.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pinchite is Not Radioactive

Pinchite Classification

Help on  Dana Class: Dana Class: (10)Oxyhalides and Hydroxyhalides
  (10.05)where Am (O,OH)p Xq
  (10.05.03)Dana Group Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.DD.25 03 - HALIDES
  03.D - Oxyhalides, Hydroxyhalides and Related Double Halides
  03.DD -With Hg
03.DD.25 Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m

Other Pinchite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Pinchite :
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: 03.DD.25





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