A fine-grained igneous rock composed primarily of orthoclase feldspar and quartz, typically found in acidic volcanic deposits.
From Greek 'eurys' (wide, broad) combined with the -ite suffix denoting minerals and rocks; the term describes the widespread occurrence of this rock type in volcanic regions.
Eurite represents an interesting geological puzzle—it's so similar to rhyolite that geologists have debated whether it deserves its own classification, showing how our systems for naming rocks evolve as our understanding improves.
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