Pinchite Mineral Data

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

IMA Status:

Approved IMA 1974

Locality:

Link to MinDat.org Location Data.

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:

r_electron=7.45 gm/cc
note: r_Pinchite=9.10 gm/cc.

Fermion Index

Fermion Index = 0.26622
Boson Index = 0.73378

Photoelectric:

PE_Pinchite=1,523.66 barns/electron
U=PE_Pinchite x r_electron=11356.85 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Pinchite is Not Radioactive

Pinchite Classification

Dana Class:

10.5.3.1 (10)Oxyhalides and Hydroxyhalides

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

(10.5.3)Dana Group

10.5.3.1 Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m

Strunz Class:

III/D.06-80 III - Halogenides

III/D - Oxi-halogenides with mercury

III/D.06 - Terlinguaite - Comancheite

III/D.06-10 Terlinguaite HgHgClO C 2/c 2/m

III/D.06-11 Aurivilliusite! HgHgOI C 2/m 2/m

III/D.06-12 Hanawaltite Hg6Hg[Cl,(OH)]2O3 Pbma 2/m 2/m 2/m

III/D.06-13 Tedhadleyite! HgHg10O4I2(Cl1.16Br0.84)2 A1 1

III/D.06-20 Poyarkovite Hg3ClO C 2/c 2/m

III/D.06-30 Kadyrelite Hg4(Br,Cl)2O I a3d 4/m 3 2/m

III/D.06-40 Eglestonite Hg6Cl3O(OH)(?) I a3d 4/m 3 2/m

III/D.06-45 Vasilyevite! (Hg2)10O6I3Cl(CO3) P1 1

III/D.06-50 Mosesite Hg2N(Cl,SO4,MoO4,CO3)·(H2O) F43m 4 3m

III/D.06-60 Gianellaite Hg4(SO4)N2 F43m 4 3m

III/D.06-70 Kleinite Hg2N(Cl,SO4)·n(H2O) C63/mmc 6/m 2/m 2/m

III/D.06-80 Pinchite Hg5O4Cl2 I bam 2/m 2/m 2/m

III/D.06-90 Comancheite Hg13(Cl,Br)8O9 Pnnm,Pnn2 Ortho

Other Pinchite Information

References:

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Pinchite

Hg++5O4Cl2
Dana No: 10.5.3.1 Strunz No: III/D.06-80
Locality:

Notes: