VESUVIAN
vesuvianite, vesuvian, idocrase
(noun) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone
Source: WordNet® 3.1
Etymology
Adjective
Vesuvian (comparative more Vesuvian, superlative most Vesuvian)
Of or relating to Mount Vesuvius.
Noun
Vesuvian (plural Vesuvians)
One who inhabits the area around Mount Vesuvius.
(dated) A kind of match or fusee for lighting cigars.
Source: Wiktionary
Ve*su"vi*an, a. Etym: [Cf. F. Vésuvien, It. Vesuviano.]
Definition: Of or pertaining to Vesuvius, a volcano near Naples.
Ve*su"vi*an, n. Etym: [G. vesuvian. See Vesuvian, a.] (Min.)
Definition: Vesuvianite.
Source: Webster’s Unabridged Dictionary 1913 Edition