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Crystal System:
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

Unnamed (probably valid)

Chemical Properties of UM1995-16-O:AuClHHide


Crystallography of UM1995-16-O:AuClHHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:

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.
  • 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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