hieratite

hieratite

[′hī·ər·ə‚tīt]
(mineralogy)
K2SiF6 A grayish mineral composed of potassium fluosilicate; occurs as deposits in volcanic holes.
References in periodicals archive ?
HIERATITE 8,9,5,18,1,20,9,20,5 (a fluoride of potassium and silicon)