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Risco Blanco Hauyne-phonolite rock sample, Gran Canaria, Canary

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Photo ID: 466
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Photo Title: Risco Blanco Hauyne-phonolite rock sample, Gran Canaria, Canary
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Keywords:
risco blanco, gran canaria, canary islands, risco blanco hauyne-phonolite rock, alkaline hauyne-phonolite lava, phonolite, phonolite lava, feldspathoid, hauyne, clinopyroxene, augite, phenocryst, sanidine, sodic alkali feldspar, anorthoclase, risco blanco igneous intrusion, intrusion, intrusive dome, roque nublo volcano, tenteniguada formation, lava, magma, volcano, geochemical differentiation, crystallization, fissure, fault, rift, dike, sill, feeder vent,
Description:
Close up image of the highly evolved alkaline hauyne-phonolite rock, which forms the Risco Blanco igneous intrusion located on the northern erosive escarpment of the Caldera de Tirajana. The rock is a fine-grained porphyritic rock of a greenish-grey colour. The matrix is composed of the feldspathoid Hauyne and of the clinopyroxine augite, and of sphene, apatite, hornblende and biotite. The most prominent phenocrysts (white) are those of alkaline feldspar sanidine and possibly the sodic alkali feldspar anorthoclase and to a lesser degree, augite, hornblende and hauyne, this feldspathoid not being very prominent within the Risco Blanco rocks and generally unrecognisable, altered to black or dark red. SiO2 – 56.80%, Al2O3 – 21.68%, Fe2O3 – 1.29%, FeO – 0.95, MgO – 0.06%, CaO – 1.16%, Na2O – 10.41%, K2O – 6.15%, MnO – 0.14%, TiO2 – 0.21, P2O5 – 0.04%, H2O – 1.40%.
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