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Cruz de Saucillo, Hauyne-phonolite rock sample, Gran Canaria, Canary Islands.

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Photo ID: 551
Gallery ID: 59
Photo Title: Cruz de Saucillo, Hauyne-phonolite rock sample, Gran Canaria, Canary Islands.
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Keywords:
cruz de saucillo, gran canaria, canary islands, hauyne-phonolite rock, hauyne-phonolite rock sample, alkaline hauyne-phonolite lava, phonolite, tephri-phonolite, phonolite lava, feldspathoid, hauyne, clinopyroxene, augite, phenocryst, sanidine, 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 Cruz de Saucillo igneous intrusion and associated lava flows, forming the high ridge in between the Tenteniguada collapse caldera, near to the north eastern edge of the island’s easternmost highlands, and the Barranco de Lechucilla. The rock is a microcrystaline porphyritic rock of a dark greenish grey colour. The matrix is composed of the feldspathoid Hauyne and of the clinopyroxine augite, and of sphene, apatite, Fe/Ti-oxide, hornblende and accessory biotite, with rare tiny crystals of nepheline. The most abundant phenocrysts are those of the feldspathoid Hauyne and to a lesser degree there are large phenocrysts of Sanidine. The Hauyne is highly altered and hardly recognisable, being of deep red or black and only rarely is it found in its beautiful blue colour. There are also small crystals of augite and of brown hornblende. There are many chemical analyses of this formation, many of which actually are of tephri-phonolite or just on the dividing line between this and phonolite. SiO2 – 52.14%, Al2O3 – 18.35%, Fe2O3 – 3.35%, FeO – 2.02%, MgO – 1.21%, CaO – 3.78%, Na2O – 9.48%, K2O – 5.66%
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