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Rojo Moncayo
It is a highly compacted, reddish-shaded sandstone sometimes with some grey zones. Its value derived from several technological studies have shown a high suitability for pavements and coatings.
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Petrographically, the sample is described as a sand, classified like Feldspathic Grauvaca (Pettijohn, 1987), of grain-supported texture. The grain-supported skeleton is made of monocrystalline quartz (54%), partially altered feldspars (4%) and fragmented lithic mainly transformed into secondary filosilicated matrix (17%). Iron oxides (5%), muscovites (4%) and biotites are also identified (2%). The cement is siliceous (4%) of sintaxial type. Overall, it is a stone with not much porosity (1%) and with little discontinuities. Primary matrix 10% is filosilicated and includes in part the iron oxides. The quartz clastos’ morphology is subangular with a low sphericity and an average size of 0.18 mm, whereas the feldspars’ clastos are subrounded with an average size of 0.13 mm. The selection is good 1,2-1,4. The contacts are predominantly precise. |
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Geographically, the Rojo Moncayo quarry is situated in Jarque del Moncayo's municipality, in Moncayo's Sierra. Geologically, the exploited materials is located in the Iberian Mountain range's central sector. They are fitted in Buntsandstein facies and are in the Triásico inferior's age.
The " Buntsandstein" facies’ formation is constituted by red sandstones of fluvial origin that have a power superior to the hundred meters and that was deposited in arid climate conditions. The main characteristic of this unit is its reddish colour which represents a secondary or diagenetic origin. This colour is due to the transformation in hematite of oxides and iron hydroxides contained in the original sediment during the diagenetic processes that allow sediment to be transformed into rock.
The exploited sandstones in Jarque of Moncayo are of medium grain and appear in banks of variable power, that can be massive or can present crossed stratification and/or parallel lamination, separated by argillaceous sections.
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Natural stone types
Rojo Moncayo
