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Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalusia, Spain

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"Cráter de la Granadilla" or "El Hoyazo" crater

Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalusia, Spain
General view of El Hoyazo hill and Rambla de Las Granatillas

Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalusia, Spain
"Cráter de la Granadilla" or "El Hoyazo" crater

Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalusia, Spain
General view of El Hoyazo hill and Rambla de Las Granatillas

Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalusia, Spain
Name(s) in local language(s):Rambla de las Granatillas, El Hoyazo, Níjar, Almería, Andalucía, España
Latitude & Longitude (WGS84): 36° 57' 20'' North , 2° 10' 9'' West
Latitude & Longitude (decimal): 36.95556,-2.16917
GeoHash:G#: eyw6nxs3w
Köppen climate type:BSk : Cold semi-arid (steppe) climate


The Hoyazo of Nijar is the remains of a volcano edifice surrounded by a reef complex forming a perfect example of fossil atoll.
It is part of volcanism calc-alkaline- potassium of Neogene age southeastern Spanish.
Its composition is very special dacitic rock (labradorite-cordierite-biotite-garnet) with numerous inclusions product of assimilation of basic intrusive rocks and metamorphic rocks.
One of the most notable features is the abundance of garnets that flow from the rock and form accumulations of genuine Garnet sands (Rambla de las Granatillas).
In this field most likely are the samples that were used to describe for the first time the mineral Cordierite by Von Schlotheim in 1801 calling it "Spanischer Lazulith",later with samples of the San Pedro de Pinatar (Murcia) Pierre Cordiere with the help of René Just Haüy describes again the mineral and gives its name.

Regions containing this locality

Iberian Peninsula

Peninsula - 1,587 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


6 valid minerals.

Detailed Mineral List:

Almandine
Formula: Fe2+3Al2(SiO4)3
Reference: Calvo, M. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs.
'Biotite'
Reference: lapis-2005-10-13
Cordierite
Formula: (Mg,Fe)2Al3(AlSi5O18)
Reference: Calvo, M. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs.
Cristobalite
Formula: SiO2
Reference: lapis-2005-10-13
Hercynite
Formula: Fe2+Al2O4
Reference: Stefan Schorn specimen (Groebner analysis; see Lapis 34 (7-8) (2009), p. 77)
Quartz
Formula: SiO2
Reference: lapis-2005-10-13
Sillimanite
Formula: Al2(SiO4)O
Reference: Kwak, T.A. (1971). Composition of natural sillimanites from volcanic inclusions and metamorphic rocks. American Mineralogist, 56, 1750-1759.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Cristobalite'4.DA.15SiO2
'Hercynite'4.BB.05Fe2+Al2O4
'Quartz'4.DA.05SiO2
Group 9 - Silicates
'Almandine'9.AD.25Fe2+3Al2(SiO4)3
'Cordierite'9.CJ.10(Mg,Fe)2Al3(AlSi5O18)
'Sillimanite'9.AF.05Al2(SiO4)O
Unclassified Minerals, Rocks, etc.
'Biotite'-

List of minerals arranged by Dana 8th Edition classification

Group 7 - MULTIPLE OXIDES
AB2X4
Hercynite7.2.1.3Fe2+Al2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in [6] and >[6] coordination
Almandine51.4.3a.2Fe2+3Al2(SiO4)3
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Sillimanite52.2.2a.1Al2(SiO4)O
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with Al substituted rings
Cordierite61.2.1.1(Mg,Fe)2Al3(AlSi5O18)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Cristobalite75.1.1.1SiO2
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Biotite'-

List of minerals for each chemical element

OOxygen
O AlmandineFe32+Al2(SiO4)3
O Cordierite(Mg,Fe)2Al3(AlSi5O18)
O CristobaliteSiO2
O HercyniteFe2+Al2O4
O QuartzSiO2
O SillimaniteAl2(SiO4)O
MgMagnesium
Mg Cordierite(Mg,Fe)2Al3(AlSi5O18)
AlAluminium
Al AlmandineFe32+Al2(SiO4)3
Al Cordierite(Mg,Fe)2Al3(AlSi5O18)
Al HercyniteFe2+Al2O4
Al SillimaniteAl2(SiO4)O
SiSilicon
Si AlmandineFe32+Al2(SiO4)3
Si Cordierite(Mg,Fe)2Al3(AlSi5O18)
Si CristobaliteSiO2
Si QuartzSiO2
Si SillimaniteAl2(SiO4)O
FeIron
Fe AlmandineFe32+Al2(SiO4)3
Fe Cordierite(Mg,Fe)2Al3(AlSi5O18)
Fe HercyniteFe2+Al2O4

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Messinian
5.333 - 7.246 Ma



ID: 2506574

Age: Miocene (5.333 - 7.246 Ma)

Description: Conglomerate, sand, reefs, yellow silt, gypsum and haloids. Conglomerate, sand and limestone

Lithology: Sandstone, conglomerate, clay; limestone and evaporites

Reference: Mapa Geológico de la Península Ibérica, Baleares y Canarias a escala 1:1.000.000. Instituto Geológico y Minero de España. [77]

Mesozoic - Paleozoic
66 - 541 Ma



ID: 3189233
Paleozoic-Mesozoic crystalline metamorphic rocks

Age: Phanerozoic (66 - 541 Ma)

Lithology: Crystalline metamorphic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Mesozoic - Paleozoic
66 - 541 Ma



ID: 3134878
Alpujarride Complex

Age: Phanerozoic (66 - 541 Ma)

Stratigraphic Name: Alpujarride Complex

Description: undifferentiated metamorphic

Lithology: Major:{marble}, Minor{phyllite,mica schist,migmatite/anatexite}

Reference: Asch, K. The 1:5M International Geological Map of Europe and Adjacent Areas: Development and Implementation of a GIS-enabled Concept. Geologisches Jahrbuch, SA 3. [147]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
- Osann, A. (1888): Ueber den Cordierit-führenden Andesit vom Hoyazo (Cabo de Gata), Zeitschrift der Deutschen Geologischen Gesellschaft, Band 40, Heft 4,p. 694 - 708
- Lapis (2005): 10-13.
-Lopez Ruiz J. y Rodriguez Badiola E. (1980) La Región volcánica Neógena del Sureste de España. Estudios Geológicos. vol. 36(1-2)
-Muñoz Espadas M.J., Martinez Frias J. y Lunar R.: Nuevos datos mineralógicos y texturales de los granates y fases asociadas del Cerro El Hoyazo (Almería) Geogaceta 30.
-Calvo, M. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs.

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