Pinchite Mineral Data

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Pinchite Mineral Data

General Pinchite Information

Chemical Formula:

Hg++5O4Cl2

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

Empirical Formula:

Hg₅O₄Cl₂

Environment:

Secondary mineral in a hydrothermal mercury deposit.

IMA Status:

Approved IMA 1974

Locality:

Terlingua, Brewster Co., Texas, USA. Link to MinDat.org Location Data.

Name Origin:

Named for William Wallace Pinch (1940- ), American mineral collector of Rochester, New York, USA, who first noted the species.

Name Pronunciation:

Pinchite

Synonym:

ICSD 75935

PDF 26-1267

Pinchite Image

Images:

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

Axial Ratios:

a:b:c =1.9031:1:1.918

Cell Dimensions:

a = 11.619, b = 6.105, c = 11.71, Z = 4; V = 830.64 Den(Calc)= 9.10

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I bam

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.837(1), 2.695(0.8), 3.94(0.6),

Crystal Structure:

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Hawthorne F C , Cooper M A , Sen Gupta P K , American Mineralogist , 79 (1994) p.1199-1203, The crystal structure of pinchite, Hg5Cl2O4

Physical Properties of Pinchite

Cleavage:

None

Color:

Black, Black brown.

Density:

9.5

Hardness:

1-2 - Between Talc and Gypsum

Streak:

reddish brown

Optical Properties of Pinchite

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

Electron Density:

Bulk Density (Electron Density)=7.45 gm/cc
note: Specific Gravity of Pinchite =9.10 gm/cc.

Fermion Index:

Fermion Index = 0.26
Boson Index = 0.74

Photoelectric:

PE_Pinchite=1,523.65 barns/electron
U=PE_Pinchite x rElectron Density=11356.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pinchite is Not Radioactive

Pinchite Classification

Dana Class:

10.05.03.01 (10)Oxyhalides and Hydroxyhalides

(10.05)where Am (O,OH)p Xq

(10.05.03)Dana Group

10.05.03.01 Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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
15 - WWW-MINCRYST

Search for Pinchite using:

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Ask about Pinchite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Pinchite Specimen Label here :

Pinchite

Hg++5O4Cl2
Dana No: 10.05.03.01 Strunz No: 03.DD.25
Locality:

Notes: