Definitions

from The Century Dictionary.

  • noun A hydrous sulphate of potassium, sodium, and ferric iron which occurs in minute yellow hexagonal scales. It is related in composition to voltaite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mineralogy A trigonal-rhombohedral mineral containing hydrogen, iron, oxygen, potassium, sodium, sulfur, and zinc.

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