Meaning of GEYSERITE in English

GEYSERITE

[gey.ser.ite] n [F geyserite, fr. geyser, fr. Icel Geysir] (ca. 1814): a hydrous silica that constitutes one variety of opal and is deposited around some hot springs and geysers in white or grayish concretions

Merriam-Webster English vocab.      Английский словарь Merriam Webster.