jarosite Min.
(ˈdʒærəʊsaɪt)
[Named 1852 from Barranco Jaroso, in Spain: see -ite.]
A hydrous sulphate of iron and potassium, occurring usually in yellowish rhombohedral crystals.
| 1854 Dana Min. (ed. 4) 389 Jarosite..may be isomorphous with alunite. 1883 M. F. Heddle in Encycl. Brit. XVI. 402/2 Jarosite..fibrous in nodules or incrusting. |