n a reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in coloring glass
A sulphide of antimony, lead, and silver, occuring in monoclinic crystals.
a hard green mineral consisting of sodium aluminum silicate in monoclinic crystalline form
A mineral of a light indigo-blue color, occurring in small masses, or in monoclinic crystals
A hydrous sulphate of lead and copper occurring in bright blue monoclinic crystals.
