A type of granitic rock or granite vein that contains tourmaline and other minerals, found in Cornish geology and named for Alvan in Cornwall.
Named after Alvan, a location in Cornwall, England, where this particular variety of granite was identified and studied by geologists.
Alvan granite contains tourmaline, a gemstone mineral, which means Cornwall's miners sometimes stumbled across beautiful crystals while quarrying—the rock itself was the treasure map to gems.
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