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Miersite

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Sir Henry A. Miers
Formula:
(Ag,Cu)I
System:
Isometric
Colour:
Yellow
Lustre:
Adamantine
Hardness:
2½ - 3
Name:
After Henry A. Miers (1858-1942), Professor of Mineralogy, Oxford, England.

Classification of Miersite

Approved, 'Grandfathered' (first described prior to 1959)
3.AA.05

3 : HALIDES
A : Simple halides, without H2O
A : M:X = 1:1, 2:3, 3:5, etc.
9.1.7.2

9 : NORMAL HALIDES
1 : AX
8.3.5

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
3 : Halides of Ag

Physical Properties of Miersite

Adamantine
Diaphaneity (Transparency):
Transparent
Colour:
Yellow
Streak:
Yellow
Hardness (Mohs):
2½ - 3
Tenacity:
Brittle
Cleavage:
Perfect
On {011}.
Fracture:
Conchoidal
Density:
5.64 g/cm3 (Measured)    5.67 g/cm3 (Calculated)

Chemical Properties of Miersite

Formula:
(Ag,Cu)I
Elements listed in formula:

Crystallography of Miersite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
F4 3m
Cell Parameters:
a = 6.5 Å
Unit Cell Volume:
V 274.63 ų (Calculated from Unit Cell)
Morphology:
Tetrahedral, often with small faces of {01}; cubo-octahedral rare by equal development of {001}, {111}, and {111}. {001} striated parallel to the edges with the tetrahedral faces. o differences exhibited by the positive and negative tetrahedra. Crusts; aggregates of indistinct crystals.
Twinning:
On {011}, repeated at times.

Epitaxial Relationships of Miersite

Epitaxial Minerals:
Epitaxy Comments:
Oriented intergrowths with iodargyrite.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.72 (w)
3.23 (s)
2.28 (m)
1.948 (m)
1.489 (vw)
1.320 (vw)
1.290 (vw)

Type Occurrence of Miersite

Associated Minerals at Type Locality:

Relationship of Miersite to other Species

Series:
Forms a series with Marshite (see here)
Other Members of Group:
3.AA.05MarshiteCuI
3.AA.05NantokiteCuCl
3.AA.05UM1999-11:I:CuSCu(I,S)
3.AA.10IodargyriteAgI
3.AA.10Tocornalite(Ag,Hg)I
3.AA.15BromargyriteAgBr
3.AA.15ChlorargyriteAgCl
3.AA.20CarobbiiteKF
3.AA.20GriceiteLiF
3.AA.20HaliteNaCl
3.AA.20SylviteKCl
3.AA.20VilliaumiteNaF
3.AA.25SalammoniacNH4Cl
3.AA.25UM1998-03-Cl:TlTlCl
3.AA.25LafossaiteTlCl
3.AA.30CalomelHgCl
3.AA.30KuzminiteHg(Br,Cl)
3.AA.30MoscheliteHgI
3.AA.35NeighboriteNaMgF3
3.AA.40ChlorocalciteKCaCl3
3.AA.45KolaritePbTeCl2
3.AA.50RadhakrishnaitePbTe3(Cl,S)2
3.AA.55ChallacolloiteKPb2Cl5
3.AA.60HephaistositeTlPb2Cl5

Other Names for Miersite

Name in Other Languages:
German:Miersit
Spanish:Miersita

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.

References for Miersite

Reference List:
Spencer, L.J. (1898) Miersite, a cubic modification of native silver iodide. Nature: 57: 574-574.

Spencer, L.J. (1901) Marshite, Miersite and Iodyrite from Broken Hill, New South Wales. Mineralogical Magazine: 13: 38-53.

Prior, G.T. (1902) The identity of kilbrickenite with geocronite: And analyses of miersite, marshite, and copper-pyrites. Mineralogical Magazine: 13: 186-190.

Quercigh (1914) Acc. Linc., Rend.: 23: 441, 711, 825.

Aminoff (1922), Geol. För. Förh.: 44: 444.

Barth and Lunde (1926) Zs. phys. Chem.: 122: 293.

Kolkmeijer and van Hengel (1934) Zeitschrift für Kristallographie: 88: 317.

Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 19-20.

Burns, G., Dacol, F.H., Shafer, M.W. (1977) Results from Raman spectra of the superionic conductor AgI. Physical Review B: 16: 1416-1425.

Millsteed, P.W. (1998) Marshite-miersite solid solution and iodargyrite from Broken Hill, New South Wales, Australia. Mineralogical Magazine: 62: 471-475.

Hull, S., Keen, D.A. (1999) Pressure-induced phase transitions in AgCl, AgBr, and AgI. Physical Review B: 59: 750-761.

Philosophical Magazine: 42: 262-263.

Internet Links for Miersite

mindat.org URL:
https://www.mindat.org/min-2707.html
Please feel free to link to this page.
Specimens:
The following Miersite specimens are currently listed for sale on minfind.com.

Localities for Miersite

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia (TL)
 
  • New South Wales
    • Yancowinna Co.
Nature (1896) 57, 574
South Australian Museum specimen in the collection of Brent Thorne
        • Broken Hill South Mine (BHS Mine; South Mine)
Nature (1896) 57, 574
Chile
 
  • Antofagasta Region
    • El Loa Province
      • Calama
        • Chuquicamata District
Miersite - xray identification by Willard Roberts SDSM Aug/77.
Mexico
 
  • Sonora
    • Mun. de Moctezuma
Lapis 2001(1), 11-40
Russia
 
  • Western-Siberian Region
    • Altaiskii Krai
      • Rudnyi Altai
Minerals offered by Excalibur minerals, July 2009; Pekov, I.V., Lykova, I.S., Bryzgalov, I.A., Ksenofontov, D.A., Zyryanova, L.A. & Litvinov, N.D. (2010): Extremely rich iodide mineralization at the Rubtsovskoe base metal deposit (North West Altay, Russia) and its genesis. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 416.
Gunnar Farber
Spain
 
  • Andalusia
    • Almería
      • Níjar
        • Rodalquilar
Christian Rewitzer et.al. (2014) Rodalquilar bei Almeria: Goldbergbau in Andalusien. LAPIS 6.2014 p. 12-29
USA
 
  • Arizona
    • Cochise Co.
      • Mule Mts
        • Warren District
[MinRec 24:421]
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 298; Graeme, R. (1993), Bisbee revisited, Min.Rec.: 24: 421-436.
    • Pima Co.
      • Tohono O'odom (Papago) Indian Reservation
        • Comobabi Mts
          • Cababi District (Comobabi District)
            • Ko Vaya
              • Mildren Mine group
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 298; Williams, S.A, (1963), Oxidation of sulfide ores in the Mildren and Steppe mining districts, Pima Co., AZ, Econ.Geol.: 58: 1119-1125.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 298; Williams, S.A, (1963), Oxidation of sulfide ores in the Mildren and Steppe mining districts, Pima Co., AZ, Econ.Geol.: 58: 1119-1125.
Mineral and/or Locality  
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