A fine-grained igneous rock that forms when granite-like magma cools quickly near the Earth's surface, often found in narrow veins cutting through other rocks.
From Cornish 'elvan' meaning granite-like stone, with the suffix '-ite' denoting a rock or mineral type. The term originated in Cornwall, England where such rocks are commonly found in tin-mining regions.
Elvanite rocks were actually the key to finding valuable tin and copper deposits in Cornwall—miners learned to follow these distinctive veins like underground treasure maps, making what sounds like a boring geology term into a real-world economic game-changer.
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