Rhyolite is an extrusive igneous rock formed during eruptions of granitic magma. Pumice, obsidian, and tuff are associated rock types. Nepheline syenite is a holocrystalline plutonic rock that consists largely of nepheline and alkali feldspar . The rocks are mostly pale colored, grey or pink, and in Syenite is a coarse-grained intrusive igneous rock with a general composition similar to that of granite, but deficient in quartz, which, if present at all, occurs in Questions about Iron Oxide & Nepheline Syenite Where as a mixture of iron and Nepheline Syenite is a form of stain that will melt out and adhere to the pot.
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