A type of coarse-grained igneous rock containing feldspar and other minerals, found in parts of Scotland.
Named after Appin, a district in Argyll and Bute, Scotland, where this rock type was first identified and studied. The -ite suffix is standard in mineralogy for naming rock and mineral types based on their location or discoverer.
Geologists name rocks after places the same way doctors name diseases after people—it's a way of honoring where something was discovered. Appinite is basically 'the rock from Appin,' and it's one of those specialized words that really only matters if you're a geology student or Scottish rock enthusiast!
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