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Sierra de Umango, Villa Castelli, General Lamadrid department, La Rioja Province, Argentinai
Regional Level Types
Sierra de UmangoSierra
Villa Castelli- not defined -
General Lamadrid departmentDepartment
La Rioja ProvinceProvince
ArgentinaCountry

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Key
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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 28° South , 68° West (est.)
Margin of Error:~11km
Locality type:Sierra
Köppen climate type:BWk : Cold desert climate


The "Sierra de Umango" is famous for its selenide-rich hydrothermal vein systems, and gave its name to the selenide species umangite. However, there are no selenides at all in the Sierra de Umango sensu stricto - the selenium mines are all in the Sierra de Cacho, a parallel mountain range just to the west of the Sierra de Umango, and separated from it by a long valley including the two Barreal salt flats.

The source of this error seems to have been the mine engineer Emilio Hünicken, ex-student at the Clausthal Mining Academy, who provided the first specimens of "Sierra de Umango" eucairite, tiemannite and what would become umangite to Klockmann around 1890. (Klockmann, F. (1891) XVIII Mineralogische Mitteilungen aus den Sammlungen der Bergakademie zu Clausthal. 1. Über einige seltene argentinische Mineralien. Zeitschrift für Kristallographie, 19, 265-275.)

Regions containing this locality

South America PlateTectonic Plate
South AmericaContinent

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals. 6 erroneous literature entries.

Detailed Mineral List:

Athabascaite
Formula: Cu5Se4
Reference: Handbook of Mineralogy
Berzelianite
Formula: Cu2Se
Reference: Economic Geology (1997) 92, 468-484.
Chalcomenite
Formula: CuSeO3 · 2H2O
Reference: American Mineralogist 35 (1950), 354; 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: 639; Economic Geology (1997) 92, 468-484.
Djurleite
Formula: Cu31S16
Reference: Eduardo Jawerbaum specimens
Eucairite
Formula: AgCuSe
Reference: Economic Geology (1997) 92, 468-484.
Klockmannite
Formula: CuSe
Reference: Ramdohr, P. (1928) Klockmannit, ein natürliches Kupferselenid. Centralblatt für Mineralogie A, 225- 232; Earley, J.W. (1949) American Mineralogist, 34, 435ff; Economic Geology (1997) 92, 468-484.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Eduardo Jawerbaum specimens
Stilleite
Formula: ZnSe
Reference: Economic Geology (1997) 92, 468-484.
Umangite
Formula: Cu3Se2
Reference: [Am Min 35 (1950), 354]; Econ Geol (1997) 92:468-484

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Athabascaite2.BA.25Cu5Se4
Berzelianite ?2.BA.20Cu2Se
Djurleite2.BA.05Cu31S16
Eucairite ?2.BA.50AgCuSe
Klockmannite ?2.CA.05bCuSe
Stilleite ?2.CB.05aZnSe
Umangite ?2.BA.25Cu3Se2
Group 4 - Oxides and Hydroxides
Chalcomenite ?4.JH.05CuSeO3 · 2H2O
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Berzelianite ?2.4.10.1Cu2Se
Djurleite2.4.7.2Cu31S16
Eucairite ?2.4.6.2AgCuSe
AmBnXp, with (m+n):p = 3:2
Umangite ?2.5.1.1Cu3Se2
AmXp, with m:p = 1:1
Klockmannite ?2.8.12.2CuSe
Stilleite ?2.8.2.2ZnSe
Miscellaneous
Athabascaite2.16.17.1Cu5Se4
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 34 - SELENITES, TELLURITES AND SULFITES
A(XO3)·xH2O
Chalcomenite ?34.2.2.1CuSeO3 · 2H2O

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H ChalcomeniteCuSeO3 · 2H2O
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O MalachiteCu2(CO3)(OH)2
O ChalcomeniteCuSeO3 · 2H2O
SSulfur
S DjurleiteCu31S16
CuCopper
Cu DjurleiteCu31S16
Cu MalachiteCu2(CO3)(OH)2
Cu AthabascaiteCu5Se4
Cu UmangiteCu3Se2
Cu ChalcomeniteCuSeO3 · 2H2O
Cu BerzelianiteCu2Se
Cu EucairiteAgCuSe
Cu KlockmanniteCuSe
ZnZinc
Zn StilleiteZnSe
SeSelenium
Se AthabascaiteCu5Se4
Se UmangiteCu3Se2
Se ChalcomeniteCuSeO3 · 2H2O
Se BerzelianiteCu2Se
Se EucairiteAgCuSe
Se StilleiteZnSe
Se KlockmanniteCuSe
AgSilver
Ag EucairiteAgCuSe

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Klockmann, F. (1891) XVIII Mineralogische Mitteilungen aus den Sammlungen der Bergakademie zu Clausthal. 1. Über einige seltene argentinische Mineralien. Zeitschrift fuer Kristallographie 19: 265-275.


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