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Keutschite

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About KeutschiteHide

Dr. Frank Keutsch
Formula:
Cu2AgAsS4
Lustre:
Metallic
Crystal System:
Tetragonal
Member of:
Name:
Named for Dr. Frank Keutsch (b. 1971), professor of chemistry at Harvard University and specialist in sulphides and sulphosalts.
Can be considered a partially Ag-substituted luzonite.

Compare the chemically similar eckerite.


Classification of KeutschiteHide

Approved
Approval Year:
2014

Physical Properties of KeutschiteHide

Metallic
Transparency:
Opaque

Chemical Properties of KeutschiteHide

Formula:
Cu2AgAsS4

Crystallography of KeutschiteHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
I4 2m
Setting:
I4 2m
Cell Parameters:
a = 5.5834(15) Å, c = 10.021(3) Å
Ratio:
a:c = 1 : 1.795
Unit Cell V:
312.40 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.79(ms)
1.966(s)
1.864(s)
1.659(s)
1.548(m)
1.270(m)
1.214(m)
Comments:
From Type Description.

Type Occurrence of KeutschiteHide

Place of Conservation of Type Material:
Type material is deposited in the reference collection of the Naturhistorisches Museum Wien, Wien, Austria, specimen number N9734

Synonyms of KeutschiteHide

Relationship of Keutschite to other SpeciesHide

Member of:
Other Members of this group:
BriartiteCu2(Fe,Zn)GeS4Tet.
ČernýiteCu2(Cd,Zn,Fe)SnS4Tet. 4 2m : I4 2m
FamatiniteCu3SbS4Tet. 4 2m : I4 2m
FerrokësteriteCu2(Fe,Zn)SnS4Tet. 4 : I4
HocartiteAg2(Fe2+,Zn)SnS4Tet. 4 2m : I4 2m
Kësterite Cu2ZnSnS4Tet. 4 : I4
KuramiteCu3SnS4Tet.
LuzoniteCu3AsS4Tet. 4 2m : I4 2m
OmariniiteCu8Fe2ZnGe2S12Orth. 2 2 2 : I2 2 2
PermingeatiteCu3SbSe4Tet.
Petrukite(Cu,Fe,Zn,Ag)3(Sn,In)S4Orth.
PirquitasiteAg2ZnSnS4Tet. 4 : I4
StanniteCu2FeSnS4Tet. 4 2m : I4 2m
StannoiditeCu+6Cu2+2(Fe2+,Zn)3Sn2S12Orth.
UM1984-30-S:CuFeSnCu2Fe2Sn3S7
Unnamed (Cu-Zn-In Sulphide)CuZn2InS4
VelikiteCu2HgSnS4Tet.
ZincobriartiteCu2(Zn,Fe)(Ge,Ga)S4Tet. 4 2m : I4 2m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Manganoquadratite2 photos of Keutschite associated with Manganoquadratite on mindat.org.
Calcite2 photos of Keutschite associated with Calcite on mindat.org.
Alabandite2 photos of Keutschite associated with Alabandite on mindat.org.
Bournonite-Seligmannite Series1 photo of Keutschite associated with Bournonite-Seligmannite Series on mindat.org.
Tennantite-Tetrahedrite Series1 photo of Keutschite associated with Tennantite-Tetrahedrite Series on mindat.org.

Other InformationHide

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 KeutschiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Topa, D., Takagi Fredrickson, R. and Stanley, C. (2014) Keutschite, IMA 2014-038. CNMNC Newsletter No. 21, August 2014, page 804; Mineralogical Magazine, 78, 797-804.

Internet Links for KeutschiteHide

Localities for KeutschiteHide

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.
Peru (TL)
 
  • Lima Department
    • Oyon Province
Topa, D., Takagi Fredrickson, R. and Stanley, C. (2014) Keutschite, IMA 2014-038. CNMNC Newsletter No. 21, August 2014, page 804; Mineralogical Magazine, 78, 797
Mineral and/or Locality  
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