Marshite Mineral Data

Marshite Mineral Data +

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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.

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 - HextetrahedralH-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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Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 35 (1997) p.785-786, A note on the crystal structure of marshite

View Additional jPOWD Structure files for Marshite
[1]

Physical Properties of Marshite

Cleavage:

[011] Perfect

Color:

Brown, Colorless, Light yellow, Dark brownish red.

Density:

5.6 - 5.9, Average = 5.75

Diaphaniety:

Transparent to subtranslucent

Fracture:

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

Hardness:

2.5 - Finger Nail

Luminescence:

Fluorescent.

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

Optical Data:

Isotropic, n=2.346.

Calculated Properties of Marshite

Electron Density:

r_electron=4.91 gm/cc
note: r_Marshite=5.70 gm/cc.

Fermion Index

Fermion Index = 0
Boson Index = 1

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Marshite is Not Radioactive

Marshite Classification

Dana Class:

9.1.7.3 (9)Anhydrous and Hydrated Halides

(9.1)where A X

(9.1.7)Dana Group

9.1.7.1 Nantokite CuCl F43m 4 3m

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

9.1.7.3 Marshite CuI F43m 4 3m

Strunz Class:

III/A.01-20 III - Halogenides

III/A - Simple halogenides, without water Metal : Halogen = 1 : 1

III/A.01 - Nantokite - Miersite series

III/A.01-10 Nantokite CuCl F43m 4 3m

III/A.01-20 Marshite CuI F43m 4 3m

III/A.01-30 Miersite (Ag,Cu)I F43m 4 3m

Other Marshite Information

References:

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

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

Marshite

CuI
Dana No: 9.1.7.3 Strunz No: III/A.01-20
Locality:

Notes: