WEATHERING OF BASALT: CHANGES IN ROCK CHEMISTRY AND .Chemical and mineralogical changes during basalt weathering. 163 . SiO2 in weathered glass falls to almost half . color-banded rock rimming the core-stone.silicon dioxide changes basalt color,Magma Composition and Igneous Rocks - Indiana University .abundance changes from one rock to the next, the abundances of all other oxides . low in SiO2 form dark colored minerals upon cooling and the resultant .. texture it is called a basalt porphyry, andesite porphyry, and rhyolite porphyry.Igneous Rocks Igneous Rocks - Brock UniversitySep 8, 2005 . change results in the rock staying at the same . Gabbro. Basalt. Peridotite. Composition. Major. Minerals. Minor. Minerals. Most Common. Colour. Quartz. Potassium Feldspar. Sodium Feldspar. (plagioclase). Amphibole.
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