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Webster 1913 Edition

(gī′zẽr-īt or gī′sẽr-īt; 277)

Noun.

[From

(Min.)

A loose hydrated form of silica, a variety of opal, deposited in concretionary cauliflowerlike masses, around some hot springs and geysers.

geyserite ‎(plural geyserites)

(mineralogy) A type of stone, a mixture of quartz and opal deposited by a geyser as it precipitates out of the boiling water.