from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral with rhombohedral crystals, KFe33+(SO4)2(OH)6.
from the GNU version of the Collaborative International Dictionary of English
- n. An ocher-yellow mineral occurring in minute rhombohedral crystals. It is a hydrous sulphate of iron and potash.
from The Century Dictionary and Cyclopedia
- n. A native hydrous sulphate of iron and potassium, occurring in ocher-yellow rhombohedral crystals, and also in granular masses.
- n. Varieties of this mineral in which the potassium is replaced by sodium and by lead have been called natrojarosite and plumbojarosite respectively.
After the place Jaroso ravine in Spain, named in 1852. (Wiktionary)