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Piedras Blancas deposit, Cerro Quico, El Sacrificio, La Cocha Department, Tucumán Province, Argentinai
Regional Level Types
Piedras Blancas depositDeposit
Cerro QuicoMountain
El SacrificioMunicipality
La Cocha DepartmentDepartment
Tucumán ProvinceProvince
ArgentinaCountry

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Key
Latitude & Longitude (WGS84):
27° 46' South , 65° 43' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
La Cocha7,066 (2016)14.4km
Los Varela1,908 (2016)25.5km
San Antonio4,290 (2015)27.0km
Graneros5,263 (2015)30.3km
Los Altos6,421 (2016)37.9km
Name(s) in local language(s):
Yacimiento "Piedras Blancas".


Wolframite deposit associated with a 400 meters x 100 meters body of quartz hosted in granite. Located in the Aconquija mountains (1,950 m elevation).

Cerro Quico, which presents the Wolframite, lies to the southwest of the province, within the 13 sheet and "Villa Alberdi" in the geological-economical Charter of the Argentina Republic, erected by the National Directorate of mining. It belongs to the cord of the Aconquija. The mineral appears on the South-East part of this hill.
Access to place is hampered even today by the lack of roads, since there from the levelling dam of San Ignacio to continue on horseback, by paths, for two hours, which are in a bad state of conservation.
The geology of the area is represented by metamorphic rocks with contribution of igneous material and intrusive rocks. The crystalline basement is characterized by the large number of rocks of mixture containing. It's quartz phyllite, micacitas, migmatitas, schists, etc...
There are also bodies and granitic dikes, apart from the fine injection, which is consistent with the schistosity. It is also necessary to include the body of quartz that appears in the southern part of the Quico Hill within this complex of injection.
Wolframite is present in radial guides or shaped mass, disseminated in the mass of quartz and in the vicinity of the contact of the quartz with granite, usually forming nests with a somewhat irregular distribution, as he was evident as a result of the few tasks carried out.
The Quartz is the main gangue and appears in a massive way in the body, which stands on the surface as a white prominence with an extension of about 400 meters long and 150 meters wide and with a North-South direction.
In the mineralized zone, it is possible to observe the presence of idiomorphic quartz crystals hyaline of regular size, having found copies up to 30 centimetres long, as well as smoked quartz and white mica. Also found diffuser quartz crystals, opalized quartz, iron oxides, manganese Oxides, Tungstite, copper minerals, opal, chalcedony.
The Wolframite occurs forming eyes or nests with crystals of more than 6 centimetres long and also is radioactive. Chemical analysis of samples of the site was conducted in the laboratories of the National Commission of atomic energy in Buenos Aires, throwing the following tenors 0.008 to 0.07 U3O8 g%g and Th 0.0052 g%g.
Genetically and Prima Facie it can be considered mineralization formed under hydrothermal conditions of medium to low temperature for primary minerals, whereas the Association of Wolframite with intrusion zone Granite-Quartz no doubt.
Other smaller bodies of Quartz are observable in the region.

The existing mineralization consists of the Association of quartz - wolframite - hübnerite - fluorite - Hematite - limonite - pyrolusite - Malachite - tungstite (ochre of tungsten), according to the paragenetic order studied in cuts polished by Chomnales (1963).
On microscopic examination, there are few Hübnerite proportions, ochre of tungsten, fluorite, hematite, limonite and Malachite, according to R. Chomnales (1963), and uncover for the extraction of these minerals is performed. On the mineralogical composition of Piedras Blancas, X-ray, microscopic and chemical determinations have been especially in areas of blasting material.
Determinations made by Porto and Diaz Taddei (1985), have recognized other mineral not quoted above, which identified it is as Powellite crystals subhedral of green, greyish to bluish, translucent, medium hardness. Sometimes also occur in parallel associations of base square dipyramid. According to the obtained density of 4.2 (± 0.5), the anion of this mineral composition can contain a partial substitution of wolframite isomorphous. Their habit is bipyramidal and usually with striations on their faces. Scattered is located in quartz being optically single positive. By observations with UV source, these sections show that this mineral is fluorescent, coloured yellowish clear, impure, and scores which seem also the mineral mass to the filling of thin vein penetrations diffuse.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


15 valid minerals.

Detailed Mineral List:

Chalcocite
Formula: Cu2S
Reference: Raúl Jorge Tauber Larry´s collection and photo
Chalcopyrite
Formula: CuFeS2
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Covellite
Formula: CuS
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Ferberite
Formula: FeWO4
Habit: Monoclinic-prismatic
Colour: brownish black
Fluorescence: no
Description: R. Chomnales (1963). Optical analysis on polished cuts.
Reference: Raúl Jorge Tauber Larry specimens. R. Chomnales (1963).
Ferrimolybdite
Formula: Fe2(MoO4)3 · nH2O
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Fluorite
Formula: CaF2
Reference: Juan C. Porto, R. L. Díaz Taddei (1985) - Manifestaciones uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina.
Hematite
Formula: Fe2O3
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Hübnerite
Formula: MnWO4
Habit: Monoclinic-Prismatic
Colour: redish brown.
Fluorescence: no
Description: R. Chomnales (1963). Optical analysis on polished cutts.
Reference: Raúl Jorge Tauber Larry specimens. R. Chomnales (1963).
'Iron Ochre'
Reference: Néstor Hillar (1964) - El yacimiento de cuarzo y wolframita de Piedras Blancas en el Cerro Quico, Dpto. de Graneros (Tucumán). Revista Minera, Tomo XXVII, Nº 1.
'Limonite'
Reference: Raúl Jorge Tauber Larry
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Raúl Jorge Tauber Larry´s collection and photo
'Manganese Oxides'
Reference: Raul Tauber Larry collection
Opal
Formula: SiO2 · nH2O
Reference: Raúl Jorge Tauber Larry
Powellite
Formula: Ca(MoO4)
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Pyrite
Formula: FeS2
Reference: Porto, J. C., Díaz Taddei, R. L. (1985). Manifetaciones Uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta Geológica Lilloana XVI:2.
Pyrolusite ?
Formula: Mn4+O2
Reference: Raul Tauber Larry collection
Quartz
Formula: SiO2
Reference: Raúl Jorge Tauber Larry´s collection and photo
Quartz var. Chalcedony
Formula: SiO2
Reference: Raúl Jorge Tauber Larry
Quartz var. Citrine
Formula: SiO2
Habit: Hexagonal prisms, terminated by romboedra or pyramidal shapes.
Colour: reddish, yellow-reddish
Fluorescence: no
Reference: Raúl Jorge Tauber Larry´s collection.
Quartz var. Milky Quartz
Formula: SiO2
Reference: Raúl J. Tauber (1972) - Informe de la expedición al Cerro Quico. Tucumán. Inédito. Informe personal.
Quartz var. Rock Crystal
Formula: SiO2
Reference: Néstor Hillar (1964) - El yacimiento de cuarzo y wolframita de Piedras Blancas en el Cerro Quico, Dpto. de Graneros (Tucumán). Revista Minera, Tomo XXVII, Nº 1.
Quartz var. Sceptre Quartz
Formula: SiO2
Reference: Raúl J. Tauber (1972) - Informe de la expedición al Cerro Quico. Tucumán. Inédito. Informe personal.
Quartz var. Smoky Quartz
Formula: SiO2
Reference: Raúl Jorge Tauber Larry specimens
Tungstite
Formula: WO3 · H2O
Reference: Raúl Jorge Tauber Larry
'Wolframite'
Formula: (Fe2+)WO4 to (Mn2+)WO4
Habit: Monoclinic-Prismatic
Colour: black - brownish black.
Fluorescence: no
Description: Chomnales (1963). Optical analysis on polished cutts.
Reference: Raúl Jorge Tauber Larry specimens. Chomnales (1963).

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Pyrite2.EB.05aFeS2
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Ferberite4.DB.30FeWO4
Hematite4.CB.05Fe2O3
Hübnerite4.DB.30MnWO4
Opal4.DA.10SiO2 · nH2O
Pyrolusite ?4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var. Chalcedony4.DA.05SiO2
var. Citrine4.DA.05SiO2
var. Milky Quartz4.DA.05SiO2
var. Rock Crystal4.DA.05SiO2
var. Sceptre Quartz4.DA.05SiO2
var. Smoky Quartz4.DA.05SiO2
Tungstite4.FJ.10WO3 · H2O
Group 5 - Nitrates and Carbonates
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Ferrimolybdite7.GB.30Fe2(MoO4)3 · nH2O
Powellite7.GA.05Ca(MoO4)
Unclassified Minerals, Rocks, etc.
'Iron Ochre'-
'Limonite'-
'Manganese Oxides'-
'Wolframite'-(Fe2+)WO4to (Mn2+)WO4

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Pyrolusite ?4.4.1.4Mn4+O2
AX3
Tungstite4.5.2.1WO3 · H2O
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Ferberite48.1.1.2FeWO4
Hübnerite48.1.1.1MnWO4
Powellite48.1.2.2Ca(MoO4)
Group 49 - HYDRATED MOLYBDATES AND TUNGSTATES
Hydrated Normal Molybdates and Tungstates
Ferrimolybdite49.2.1.1Fe2(MoO4)3 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
'Iron Ochre'-
'Limonite'-
'Manganese Oxides'-
Quartz
var. Chalcedony
-SiO2
var. Citrine-SiO2
var. Milky Quartz-SiO2
var. Rock Crystal-SiO2
var. Sceptre Quartz-SiO2
var. Smoky Quartz-SiO2
'Wolframite'-(Fe2+)WO4 to (Mn2+)WO4

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H OpalSiO2 · nH2O
H TungstiteWO3 · H2O
H FerrimolybditeFe2(MoO4)3 · nH2O
CCarbon
C MalachiteCu2(CO3)(OH)2
OOxygen
O Wolframite(Fe2+)WO4 to (Mn2+)WO4
O FerberiteFeWO4
O HübneriteMnWO4
O Quartz var. CitrineSiO2
O QuartzSiO2
O Quartz var. Smoky QuartzSiO2
O MalachiteCu2(CO3)(OH)2
O Quartz var. ChalcedonySiO2
O OpalSiO2 · nH2O
O TungstiteWO3 · H2O
O Quartz var. Rock CrystalSiO2
O Quartz var. Milky QuartzSiO2
O Quartz var. Sceptre QuartzSiO2
O PowelliteCa(MoO4)
O HematiteFe2O3
O FerrimolybditeFe2(MoO4)3 · nH2O
O PyrolusiteMn4+O2
FFluorine
F FluoriteCaF2
SiSilicon
Si Quartz var. CitrineSiO2
Si QuartzSiO2
Si Quartz var. Smoky QuartzSiO2
Si Quartz var. ChalcedonySiO2
Si OpalSiO2 · nH2O
Si Quartz var. Rock CrystalSiO2
Si Quartz var. Milky QuartzSiO2
Si Quartz var. Sceptre QuartzSiO2
SSulfur
S ChalcociteCu2S
S PyriteFeS2
S ChalcopyriteCuFeS2
S CovelliteCuS
CaCalcium
Ca FluoriteCaF2
Ca PowelliteCa(MoO4)
MnManganese
Mn Wolframite(Fe2+)WO4 to (Mn2+)WO4
Mn HübneriteMnWO4
Mn PyrolusiteMn4+O2
FeIron
Fe Wolframite(Fe2+)WO4 to (Mn2+)WO4
Fe FerberiteFeWO4
Fe HematiteFe2O3
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe FerrimolybditeFe2(MoO4)3 · nH2O
CuCopper
Cu MalachiteCu2(CO3)(OH)2
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu CovelliteCuS
MoMolybdenum
Mo PowelliteCa(MoO4)
Mo FerrimolybditeFe2(MoO4)3 · nH2O
WTungsten
W Wolframite(Fe2+)WO4 to (Mn2+)WO4
W FerberiteFeWO4
W HübneriteMnWO4
W TungstiteWO3 · H2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
González Bonorino, F. (1960) Descripción de la Hoja 12 e "Villa Alberdi" (Tucumán). Dirección Nacional de Minería: 74. Buenos Aires.
Peña, Hugo A. (1963) Nota preliminar sobre la presencia de wolframita en la provincia de Tucumán. Acta geológica Lilloana: 4. Tucumán.
Chomnales, R. (1963) Mineralogical composition of Piedras Blancas.
Hillar, Néstor (1964) El yacimiento de cuarzo y wolframita de Piedras Blancas en el Cerro Quico, Dpto. de Graneros (Tucumán). Revista Minera: 27(1).
Peña, Hugo A. (1970) Minerales y rocas de aplicación de la Provincia de Tucumán. Dirección Provincial de Minas. Tucumán.
Tauber Larry, Raúl J. (1972) Informe de la expedición al Cerro Quico. Tucumán. Inédito. Informe personal.
Sub Secretaría de Minería de la Nación (1974) Reporte técnico.
Díaz Taddei, R.L. (1982) Estudio geológico minero del yacimiento de cuarzo de Piedras Blancas. Acta geológica Lilloana: 16(1). Tucumán.
Porto, Juan C., Díaz Taddei, R.L. (1985) Manifestaciones uraníferas en el Cerro Quico, Sierra de Aconquija, Tucumán, República Argentina. Acta geológica Lilloana: 16(2). Tucumán.

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