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Roque del Saucillo, tephri-phonolite rock sample, Gran Canaria, Canary islands.

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Photo ID: 553
Gallery ID: 59
Photo Title: Roque del Saucillo, tephri-phonolite rock sample, Gran Canaria, Canary islands.
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Keywords:
roque del saucillo, tephri-phonolite rock sample, gran canaria, canary islands, tephri-phonolite, tephri-phonolite lava, alkaline tephri-phonolite rock, feldspathoid, hauyne, clinopyroxene, augite, hornblende, 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, erosion,
Description:
Close up image of the highly evolved alkaline tephri-phonolite rock, which forms the 1690m high Roque del Saucillo igneous intrusion, located along the steep escarpment of the Tenteniguada collapse caldera, near to the north eastern edge of the island’s easternmost highlands. The rock is of a light grey colour with a slight greenish tinge and contains a small number of feldspathoid crystals of hauyne, which are highly altered and hardly recognisable, being of deep red or black. There are also crystals of augite and of dark brown hornblende and few but very large phenocrysts of sanidine of 1 cm. The intrusion is dated as 2.95 million years old. SiO2 – 49.95%, Al2O3 – 17.88%, Fe2O3 – 3.13%, FeO – 2.64%, MgO – 2.30%, CaO – 5.56%, Na2O – 6.74%, K2O – 4.84%
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