dem·an·toid /ˈdɛmənˌtɔɪd/
翠榴石; 鈣鐵榴石
De·man·toid n. Min. A yellow-green, transparent variety of garnet found in the Urals. It is valued as a gem because of its brilliancy of luster, whence the name.
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demantoid
n : a green andradite used as a gemstone