Marshite
A valid IMA mineral species - grandfathered
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About Marshite
Formula:
CuI
Colour:
Colorless to pale yellow when fresh, turns pink to dark brownish-red.
Lustre:
Sub-Adamantine, Greasy
Hardness:
2½
Specific Gravity:
5.68
Crystal System:
Isometric
Member of:
Name:
After Australian C.W. Marsh, who first described the mineral.
Type Locality:
Isostructural with:
Unique Identifiers
Mindat ID:
2580
Long-form identifier:
mindat:1:1:2580:1
IMA Classification of Marshite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Cu1+I1-
Classification of Marshite
3.AA.05
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.7.3
9 : NORMAL HALIDES
1 : AX
9 : NORMAL HALIDES
1 : AX
8.2.11
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
2 : Halides of Cu
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
2 : Halides of Cu
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Msh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Marshite
Sub-Adamantine, Greasy
Transparency:
Transparent
Comment:
Becomes dull on extended exposure to light
Colour:
Colorless to pale yellow when fresh, turns pink to dark brownish-red.
Streak:
Yellow
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{011}.
{011}.
Fracture:
Conchoidal, Sub-Conchoidal
Density:
5.68 g/cm3 (Measured) 5.71 g/cm3 (Calculated)
Optical Data of Marshite
Type:
Isotropic
Pleochroism:
Non-pleochroic
Comments:
May exhibit anomalous birefringence.
Chemistry of Marshite
Mindat Formula:
CuI
Elements listed:
Crystallography of Marshite
Crystal System:
Isometric
Class (H-M):
43m - Hextetrahedral
Space Group:
F43m
Cell Parameters:
a = 6.05 Å
Unit Cell V:
221.45 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals usually tetrahedral, with modifying {001} or other forms; rarely cubo-octahedral through equal development of {001}, {111} and {_111}. {001} and {hhl} striated parallel to the edges with the tetrahedra. Positive and negative tetrahedra exhibit no differences in surface characteristics.
Twinning:
On {111}, repeated at times.
Comment:
Tetrahedral
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005529 | Marshite | Cooper M A, Hawthorne F C (1997) A note on the crystal structure of marshite The Canadian Mineralogist 35 785-786 | ![]() | 1997 | 0 | 293 | |
| 0015184 | Marshite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015183 | Marshite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015182 | Marshite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015181 | Marshite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0015180 | Marshite | Hull S, Keen D A (1994) High-pressure polymorphism of the copper(I) halides: A neutron-diffraction study to ~10 GPa Physical Review B50 5868-5885 | 1994 | 0 | 293 | ||
| 0011522 | Marshite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 85-237 | 1963 | 0 | 293 | ||
| 0018105 | Marshite | Wyckoff R, Posnjak E (1922) The crystal structures of the cuprous halides _cod_database_code 1011239 Journal of the American Chemical Society 44 30-36 | 1922 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.49 Å | (100) |
| 3.03 Å | (10) |
| 2.14 Å | (60) |
| 1.82 Å | (30) |
| 1.51 Å | (10) |
| 1.39 Å | (10) |
| 1.24 Å | (10) |
| 1.16 Å | (10) |
Comments:
6-246 (synthetic)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47g : [Halogen-bearing surface weathering minerals] |
Type Occurrence of Marshite
Associated Minerals at Type Locality:
Synonyms of Marshite
Other Language Names for Marshite
Varieties of Marshite
| Cupro-iodargyrite | A silver-bearing variety of marshite with approximately a 1:1 Ag:Cu ratio. |
Relationship of Marshite to other Species
Member of:
Other Members of Chlorargyrite Group:
| Bromargyrite | AgBr | Iso. m3m(4/m32/m) : Fm3m |
| Chlorargyrite | AgCl | Iso. m3m(4/m32/m) : Fm3m |
| Miersite | (Ag,Cu)I | Iso. 43m : F43m |
| Nantokite | CuCl | Iso. 43m : F43m |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 24 photos of Marshite associated with Cuprite | Cu2O |
| 11 photos of Marshite associated with Atacamite | Cu2(OH)3Cl |
| 10 photos of Marshite associated with Native Copper | Cu |
| 4 photos of Marshite associated with Smithsonite | ZnCO3 |
| 4 photos of Marshite associated with Brochantite | Cu4(SO4)(OH)6 |
| 4 photos of Marshite associated with Antlerite | Cu3(SO4)(OH)4 |
| 3 photos of Marshite associated with Aurichalcite | (Zn,Cu)5(CO3)2(OH)6 |
| 3 photos of Marshite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Marshite associated with 'Chalcotrichite' | Cu2O |
| 2 photos of Marshite associated with Quartz | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 3.AA. | Brontesite | (NH4)3PbCl5 |
| 3.AA.05 | Nantokite | CuCl |
| 3.AA.05 | 'UM1999-11:I:CuS' | Cu(I,S) |
| 3.AA.05 | Miersite | (Ag,Cu)I |
| 3.AA.10 | Tocornalite | (Ag,Hg)I (?) |
| 3.AA.10 | Iodargyrite | AgI |
| 3.AA.15 | Bromargyrite | AgBr |
| 3.AA.15 | Chlorargyrite | AgCl |
| 3.AA.20 | Sylvite | KCl |
| 3.AA.20 | Halite | NaCl |
| 3.AA.20 | Villiaumite | NaF |
| 3.AA.20 | Carobbiite | KF |
| 3.AA.20 | Griceite | LiF |
| 3.AA.25 | 'UM1998-03-Cl:Tl' | TlCl |
| 3.AA.25 | Nataliyamalikite | TlI |
| 3.AA.25 | Lafossaite | Tl(Cl,Br) |
| 3.AA.25 | Salammoniac | NH4Cl |
| 3.AA.30 | Calomel | [Hg2]2+Cl2 |
| 3.AA.30 | Moschelite | [Hg2]2+I2 |
| 3.AA.30 | Kuzminite | HgBr |
| 3.AA.35 | Neighborite | NaMgF3 |
| 3.AA.35 | Parascandolaite | KMgF3 |
| 3.AA.40 | Javorieite | KFeCl3 |
| 3.AA.40 | Chlorocalcite | KCaCl3 |
| 3.AA.45 | Kolarite | PbTeCl2 |
| 3.AA.50 | Radhakrishnaite | PbTe3(Cl,S)2 |
| 3.AA.55 | Challacolloite | KPb2Cl5 |
| 3.AA.60 | Hephaistosite | TlPb2Cl5 |
| 3.AA.90 | Pseudocotunnite | K2PbCl4 |
Fluorescence of Marshite
Frequently fluorescent red in both SW and LW
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Marshite
mindat.org URL:
https://www.mindat.org/min-2580.html
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References for Marshite
Reference List:
Spencer, L. J. (1901) Marshite, Miersite, and Iodyrite from Broken Hill, New South Wales. Mineralogical Magazine and Journal of the Mineralogical Society, 13 (59) 38-53 doi:10.1180/minmag.1901.013.59.04
Prior, G. T. (1902) The Identity of Kilbriekenite with Geocronite : and Analyses of Miersite, Marshite, and Copper-pyrites. Mineralogical Magazine and Journal of the Mineralogical Society, 13 (60) 186-190 doi:10.1180/minmag.1902.13.60.07
Jarrell, O. W. (1939) Marshite and other minerals from Chuquicamata, Chile. American Mineralogist, 24 (10) 629-635
Localities for Marshite
Showing 22 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Palache et al. (1951) +1 other reference |
| Steve Sorrell Collection | |
| Marsh (1892) | |
| Museum Victoria collection | |
| Birch et al. (1997) |
| Smith (1987) | |
| Lavinsky (n.d.) |
| Elliot (1990) |
| Sorrell (n.d.) |
Brazil | |
| Thomas et al. (2023) |
Chile | |
| Jarrell (1939) +2 other references |
| Maurizio Dini collection - analysed ... |
| Chouinard et al. (2005) |
| [var: Cupro-iodargyrite] Palache et al (1944) |
Germany | |
| [var: Cupro-iodargyrite] Der Aufschluss Vol.55 |
Mexico | |
| Jones et al. (2021) |
Mongolia | |
| Davaasuren et al. (2016) |
Russia | |
| Minerals offered by Excalibur minerals +1 other reference |
| Kuzhuget et al. (2015) |
South Africa | |
| Meulenbeld et al. (2014) |
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Rubtsovsk Mine, Rubtsovsky District, Altai Krai, Russia