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UM1995-16-O:AuClH

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Formula:
AuO(OHCl)•nH2O
Crystal System:
Isometric
First natural purely gold oxidic mineral and first natural purely gold oxyhydroxide.

A product of gold oxidation. As round grains, below 0.1 microns in diameter; rims around gold. Also associated with feroxyhyte, lepidocrocite, hematite, magnetite, and Fe & Bi tellurates. Deposited prior to goethite formation.

Light violet or purple in reflected light.

Other oxidic gold minerals are UM1993-29-TeO:AuPb, UM1993-30-TeO:AuPb, UM1998-11-O-AuHSb, and 'Unnamed (Auroantimonate)'.

Electron microprobe analysis results, wt.%: Au 67.06 61.72, 67.57; Ag 5.53; Si 2.14 ; O generally ~25, Cl insignificant.


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Classification of UM1995-16-O:AuClHHide

Notes:
Unnamed (probably valid)

Chemical Properties of UM1995-16-O:AuClHHide

Formula:
AuO(OHCl)•nH2O

Crystallography of UM1995-16-O:AuClHHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Setting:
Fm3m
Cell Parameters:
a = 4.95 Å
Unit Cell V:
121.29 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.47(
2.02(
1.75(
1.43(

Other InformationHide

IR Spectrum:
[cm-1]: 3480, 3390, 1030, 580-620 (typical for gold hydroxide), 530
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 UM1995-16-O:AuClHHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Novgorodova, M.L., Generalov, M.E., Trubkin, N.V. (1995): New gold in weathering crusts of the southern Urals. Geology of Ore Deposits: 37(1): 32-43; in: Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1996): New mineral names. American Mineralogist: 81: 768
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)
Internet Links for UM1995-10-E:PtRhRu

Internet Links for UM1995-16-O:AuClHHide

Localities for UM1995-16-O:AuClHHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Orenburg Oblast
Novgorodova, M.L., Generalov, M.E., Trubkin, N.V. (1995): New gold in weathering crusts of the southern Urals. Geology of Ore Deposits: 37(1): 32-43; in: Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1996): New mineral names. American Mineralogist: 81: 768
 
Mineral and/or Locality  
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