elvan
淡英斑岩
Elv·an, Elv·an·ite, n. The rock of an elvan vein, or the elvan vein itself; an elvan course.
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Elv·an a.
1. Pertaining to elves; elvish.
2. Mining Of or pertaining to certain veins of feldspathic or porphyritic rock crossing metalliferous veins in the mining districts of Cornwall; as, an elvan course.
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