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geyserite 硅华; 硅华 矽华; 矽华 Geyserite \ Gey" ser* ite\ ( g[ imac]" z[~ e] r*[ imac] t or g[ imac]" s[~ e] r*[ imac] t; 277), n. [ From { Geyser}.] ( Min.) A loose hydrated form of silica, a variety of opal, deposited in concretionary cauliflowerlike masses, around some hot springs and geysers. [ 1913 Webster]
Opal \ O" pal\, n. [ L. opalus: cf. Gr. ?, Skr. upala a rock, stone, precious stone: cf. F. opale.] ( Min.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. [ 1913 Webster] Note: The { precious opal} presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of color in a reddish ground, is called the { harlequin opal}. The { fire opal} has colors like the red and yellow of flame. { Common opal} has a milky appearance. { Menilite} is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are { cacholong}, { girasol}, { hyalite}, and { geyserite}. [ 1913 Webster]
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