Marshite Mineral Data

General Marshite Information

Chemical Formula:

CuI

Composition:

Molecular Weight = 190.45 gm

Copper 33.37 % Cu 37.57 % Cu₂O

Iodine 66.63 % I 66.63 % I

- % I -4.20 % -O=I₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CuI

Environment:

Found with oxidized copper minerals.

IMA Status:

Valid Species (Pre-IMA) 1892

Locality:

Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for C. W. Marsh, Autralian mineral collector who first described the mineral.

Name Pronunciation:

Marshite

Synonym:

ICSD 76611

PDF 6-246

Marshite Image

Images:

Marshite

Comments: Translucent tetragonal crystal of marshite on matrix.
Location: Broken Hill, New South Wales, Australia. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Marshite Crystallography

Cell Dimensions:

a = 6.054, Z = 4; V = 221.88 Den(Calc)= 5.70

Crystal System:

Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: F43m

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

By Intensity(I/I_o): 3.493(1), 2.139(0.55), 1.824(0.3),

Forms:

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Forms: ( 1 1 3) ( 2 2 3) ( 1 1 1) ( 0 0 1)

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Physical Properties of Marshite

Cleavage:

{011} Perfect

Color:

Brown, Colorless, Light yellow, Dark brownish red.

Density:

5.6 - 5.9, Average = 5.75

Diaphaneity:

Transparent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent, Long UV=dark red.

Luster:

Adamantine - Greasy

Streak:

yellow

Optical Properties of Marshite

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2361,KPDmeas= 0.2341,KC= 0.2392
Ncalc = 2.34 - 2.41

Optical Data:

Isotropic, n=2.346.

Calculated Properties of Marshite

Electron Density:

Bulk Density (Electron Density)=4.91 gm/cc
note: Specific Gravity of Marshite =5.70 gm/cc.

Fermion Index:

Fermion Index = 0
Boson Index = 1

Photoelectric:

PE_Marshite= 276.75 barns/electron
U=PE_Marshite x rElectron Density=1,358.41 barns/cc.

Radioactivity:

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

Marshite Classification

Dana Class:

09.01.07.03 (09)Anhydrous and Hydrated Halides

(09.01)where A X

(09.01.07)Nantokite Series

09.01.07.01 Nantokite CuCl F43m 4 3m

09.01.07.02 Miersite (Ag,Cu)I F43m 4 3m

09.01.07.03 Marshite CuI F43m 4 3m

Strunz Class:

03.AA.05 03 - HALIDES

03.A - Simple Halides, Without H2O

03.AA -M:X = 1:1, 2:3, 3:5, etc.

03.AA.05 Marshite CuI F43m 4 3m

03.AA.05 Nantokite CuCl F43m 4 3m

03.AA.05 Miersite (Ag,Cu)I F43m 4 3m

Other Marshite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Marshite :
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

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

Marshite

CuI
Dana No: 09.01.07.03 Strunz No: 03.AA.05
Locality:

Notes:

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