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Nepheline-basanite rock sample, Barranco del Draguillo, Gran Canaria.

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Photo ID: 452
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Photo Title: Nepheline-basanite rock sample, Barranco del Draguillo, Gran Canaria.
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Keywords:
barranco del draguillo, gran canaria, canary islands, nepheline-basanite rock, nepheline-basanite lava, nepheline-basanite, foidite, nepheline, plagioclase, olivine, phenocryst, iddingsite, microcrysts, augite,
Description:
Rock sample from a Nepheline-basanite lava flow, with columnar jointing in the bottom of the east side of the Barranco del Draguillo, located in eastern Gran Canaria. The lava has had a chemical analysis and is classed as a foidite, however the analysis can not separately identify the nepheline content to the plagioclase owing to the fact that their crystallization is diffuse, this rock have been classed as a nepheline-basanite. The broken rock (inside) is a light grey to light brownish-grey colour, fine grained, with varying amounts of olivine phenocrysts which are lightly to moderately altered to iddingsite and with a greater number of altered olivine microcysts. There are also few small augite phenocrysts. The rock samples vary considerably along the lava flow with some containing more olivine than others. SiO2 – 39.36%, Al2O3 – 10.57%, Fe2O3 – 4.20%, FeO – 7.91%, MgO – 13.90%, CaO – 13.08%, Na2O – 2.90%, K2O – 0.48%, MnO – 0.18%, TiO2 – 3.00%, P2O5 – 1.16%, H2O – 2.96%.
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