roscoelite
/ˈrɒskə(ʊ)lʌɪt/Mineralogy
noun
A vanadium-containing mineral of the mica group, occurring as minute greenish or brownish scales.
- Roscoelite is a silicate and hydroxide of potassium, vanadium, and aluminium, K(V,Al,Mg)2AlSi3O10(OH)2. Crystal system: monoclinic..
Origin
Late 19th century. From the name of Sir Henry Roscoe, English chemist + -lite.