Geerite
A valid IMA mineral species
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About Geerite
Formula:
Cu8S5
"Extended" formula is Cu+6Cu2+2S5 (Goble, 1985).
Colour:
Bluish-white. May be iridescent.
Lustre:
Metallic, Sub-Metallic
Hardness:
3½ - 4
Specific Gravity:
5.61 (Calculated)
Crystal System:
Trigonal
Name:
Named by R.J. Goble and George Robinson in 1980 in honor of Adam Carl Geer, Jr. (30 September 1895 - 1 November 1973, Utica, New York, USA), who collected the original specimens.
May be partly or completely replaced by spionkopite.
Structurally closely related to digenite.
Compare UM1976-15-S:CuSe.
Structurally closely related to digenite.
Compare UM1976-15-S:CuSe.
Unique Identifiers
Mindat ID:
1666
Long-form identifier:
mindat:1:1:1666:3
GUID
(UUID V4):
(UUID V4):
0fb4185c-7a2f-4c5f-866d-0c89d82aadd2
IMA Classification of Geerite
Approved
Approval year:
1978
First published:
1980
Classification of Geerite
2.BA.05
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
A : With Cu, Ag, Au
3.1.7
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. of Cu
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
1 : Sulphides etc. 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 |
|---|---|---|
| Gee | 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 Geerite
Metallic, Sub-Metallic
Transparency:
Opaque
Colour:
Bluish-white. May be iridescent.
Hardness:
3½ - 4 on Mohs scale
Hardness:
VHN25=75 - 96 kg/mm2 - Vickers
Tenacity:
Brittle
Density:
5.61 g/cm3 (Calculated)
Optical Data of Geerite
Anisotropism:
Moderate in yellows
Bireflectance:
Weak
Colour in reflected light:
Bluish white
Internal Reflections:
None
Pleochroism:
Weak
Chemistry of Geerite
Mindat Formula:
Cu8S5
"Extended" formula is Cu+6Cu2+2S5 (Goble, 1985).
"Extended" formula is Cu+6Cu2+2S5 (Goble, 1985).
Elements listed:
Common Impurities:
Fe,Zn
Crystallography of Geerite
Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Cell Parameters:
a = 3.83 Å, c = 46.84 Å
Ratio:
a:c = 1 : 12.23
Unit Cell V:
595.04 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Coatings and thin platelets
Comment:
Space group R-3m, R3m or R32. Structure undetermined(?). Goble & Robinson (1980) give cubic space group F4-3m, a = 5.410 Å.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.128 Å | (100) |
| 2.712 Å | (10) |
| 1.918 Å | (50) |
| 1.870 Å | (10) |
| 1.683 Å | (10) |
| 1.637 Å | (30) |
| 1.109 Å | (20) |
Comments:
Close to data of sphalerite.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) |
Geological Setting:
Serpentine hosted chromite-magnetite deposit
Type Occurrence of Geerite
General Appearance of Type Material:
Thin, iridescent coating or as platelets up to approximately 15 µm thick, oriented along cleavage planes of sphalerite. Partly or completely replaced by spionkopite.
Place of Conservation of Type Material:
New York State Museum, Albany, New York, USA.
The Natural History Museum, London, England, number 1986,482.
Queen’s University, Kingston, Ontario, Canada.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, number 144186.
Canadian Museum of Nature, Ottawa, Ontario, Canada, number 48618.
The Natural History Museum, London, England, number 1986,482.
Queen’s University, Kingston, Ontario, Canada.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, number 144186.
Canadian Museum of Nature, Ottawa, Ontario, Canada, number 48618.
Geological Setting of Type Material:
Replacement of sphalerite
Associated Minerals at Type Locality:
Reference:
Goble, R.J., Robinson, G. (1980) Geerite, Cu1.60S, a new copper sulfide from Dekalb Township, New York. The Canadian Mineralogist: 18: 519–523.
Synonyms of Geerite
Copper Sulphides (in part)
Other Language Names for Geerite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.BA. | Orileyite | (Fe,Cu)2As |
| 2.BA. | Alburnite | Ag8GeTe2S4 |
| 2.BA. | Dzierżanowskite | CaCu2S2 |
| 2.BA. | Makotoite | Ag12(Cu3Au)S8 |
| 2.BA. | Xuwenyuanite | Ag9Fe3+Te2S4 |
| 2.BA.05 | Chalcocite | Cu2S |
| 2.BA.05 | Djurleite | Cu31S16 |
| 2.BA.05 | Roxbyite | Cu9S5 |
| 2.BA.10 | Anilite | Cu7S4 |
| 2.BA.10 | Digenite | Cu9S5 |
| 2.BA.15 | Bornite | Cu5FeS4 |
| 2.BA.20 | Bellidoite | Cu2Se |
| 2.BA.20 | Berzelianite | Cu2-xSe (x ≈ 0.12) |
| 2.BA.25 | Athabascaite | Cu5Se4 |
| 2.BA.25 | Umangite | Cu3Se2 |
| 2.BA.30 | Rickardite | Cu7Te5 |
| 2.BA.30 | Weissite | Cu2-xTe |
| 2.BA.35 | Acanthite | Ag2S |
| 2.BA.35 | Spryite | Ag8(As3+0.5As5+0.5)S6 |
| 2.BA.40 | Mckinstryite | Ag5-xCu3+xS4 |
| 2.BA.40 | Stromeyerite | AgCuS |
| 2.BA.40d | UM2003-13-S:AgAuCu | Ag6AuCu2S5 |
| 2.BA.42 | Honeaite | Au3TlTe2 |
| 2.BA.45 | Jalpaite | Ag3CuS2 |
| 2.BA.45 | Kurilite | Ag8Te3Se |
| 2.BA.45 | Selenojalpaite | Ag3CuSe2 |
| 2.BA.47 | Spiridonovite | (Cu1-xAgx)2Te |
| 2.BA.50 | Eucairite | AgCuSe |
| 2.BA.50 | Wuyanzhiite | Cu2S |
| 2.BA.52 | Argentite | Ag2S |
| 2.BA.55 | Aguilarite | Ag4SeS |
| 2.BA.55 | Naumannite | Ag2Se |
| 2.BA.60 | Cervelleite | Ag4TeS |
| 2.BA.60 | Hessite | Ag2Te |
| 2.BA.60 | Chenguodaite | Ag9Fe3+Te2S4 |
| 2.BA.65 | Henryite | (Cu,Ag)3+xTe2 , with x ~ 0.40 |
| 2.BA.65 | Stützite | Ag5-xTe3, x = 0.24-0.36 |
| 2.BA.70 | Argyrodite | Ag8GeS6 |
| 2.BA.70 | Canfieldite | Ag8SnS6 |
| 2.BA.70 | Putzite | (Cu4.7Ag3.3)GeS6 |
| 2.BA.75 | Fischesserite | Ag3AuSe2 |
| 2.BA.75 | Penzhinite | (Ag,Cu)4Au(S,Se)4 |
| 2.BA.75 | Petrovskaite | AuAgS |
| 2.BA.75 | Petzite | Ag3AuTe2 |
| 2.BA.75 | Uytenbogaardtite | Ag3AuS2 |
| 2.BA.80 | Bezsmertnovite | (Au,Ag)4Cu(Te,Pb) |
| 2.BA.80 | Bilibinskite | PbCu2Au3Te2 |
| 2.BA.80 | Bogdanovite | (Au,Te,Pb)3(Cu,Fe) |
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 Geerite
mindat.org URL:
https://www.mindat.org/min-1666.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Geerite
Localities for Geerite
symbol to view information about a locality.
The 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.
Atlantic Ocean | |
| Firstova et al. (2016) |
| Mozgova et al. (2007) | |
| Gablina et al. (2006) | |
| Maslennikov et al. (2023) | |
| Firstova et al. (2019) |
Australia | |
| Richardson et al. (1997) |
| Laurie J. Lawrence et al. (1999) +1 other reference |
| |
| Ogilvie (2014) |
Austria | |
| Leitner (2013) |
| Raith et al. (2015) | |
| Jakely (Hrsg.) | |
Canada | |
| Mathieu et al. (2018) |
| Mineralium Deposita 44 (2009) |
| Cabral et al. (2007) |
China | |
| Huang et al. (2014) |
| YANG et al. (2014) |
Czech Republic | |
| Sejkora et al. (2021) |
| Dolníček et al. (2019) |
| Litochleb J. et al. (Šumava, Česká republika) |
DR Congo | |
| Canadian Mineralogist 46 (2008) |
Germany | |
| Walenta (1992) |
| Weiß (1990) |
Greece | |
| Eliopoulos +3 other references | |
India | |
| Sikka et al. (1991) |
Indian Ocean | |
| Lalou et al. (1998) |
Iran | |
| Sadati et al. (2016) |
| Altenberger et al. (Ag-Au) |
| Mirza et al. (2018) |
| www.fos.ut.ac.ir (2004) +1 other reference |
Italy | |
| Paolo Gasparetto et al. (2014) |
| Pegoraro S. et al. (2009) |
Japan | |
| Sueoka Y (2013) |
| Matsubara et al. (2006) |
Kazakhstan | |
| Pavlova +3 other references |
Mongolia | |
| Khishgee et al. (2014) |
| Khishgee et al. (2015) |
Papua New Guinea | |
| Noku et al. (2012) |
Poland | |
| Jadwiga PIECZONKA et al. (2008) |
| Kruszewski et al. (2019) |
| Kucha H. 2007: Mineralogia kruszcowa i ... |
| Oszczepalski et al. (2017) |
| Oszczepalski et al. (2017) |
Romania | |
| Hirtopanu (2006) |
Russia | |
| Michurin et al. (2024) |
| Zaykov et al. (2017) |
| Tolstykh et al. (2021) |
| Palyanova et al. (2023) |
| Chernyavsky et al. (2012) |
| Nenasheva et al. (2011) |
| Palyanova et al. (2018) |
Saudi Arabia | |
| Bakhsh (2018) |
| Bakhsh (2018) | |
Spain | |
| Castillo et al. (2009) |
Switzerland | |
| Stalder et al. (1998) |
UK | |
| Ixer et al. (2005) |
| Cotterell et al. (2011) |
USA | |
| Merritt Stephen Enders (2000) |
| Moore-Roth (2012) |
| Northrop et al. (1996) |
| In the collection of Brent Thorne. ... |
| Goble et al. (1980) |
Zambia | |
| Jacobs (2016) |
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De Kalb Township, St. Lawrence County, New York, USA