Tags: Chemical Substance, Mineral.
Roscoelite is a green mineral from the mica group that contains vanadium.The chemical formula is K(V3+ Al Mg)2AlSi3O10(OH)2.Crystals of roscoelite take on the monoclinic form and are from the 2/m point group.The appearance is semi transparent to translucent coloured olive brown to green brown. The lustre is pearly. The mineral shows pleochroism with X showing green-brown and Y and Z axes showing olive-green colour.