geyserite
gey·ser·ite
noun \-zə-ˌrīt\Definition of GEYSERITE
: a variety of opal that is deposited around some hot springs and geysers in white or grayish concretions
Origin of GEYSERITE
French geysérite, from geyser, from Icelandic Geysir
First Known Use: circa 1814
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