In modern Mineralogy. The name of a hydrous silicate of copper, green in colour, with a shining lustre, and often opal-like in texture.

A monoclinic silicate of sodium, potassium, lithium, ferrous iron, manganese, and titanium, usually occurring as black prismatic crystals.

A rare manganese-containing silicate mineral of the pyroxenoid group, found as pink to brown crystals in some metamorphic and metasomatic rocks.

A rare, yellow silicate mineral of the pyroxenoid group, originally found in lunar rock samples and later in terrestrial gabbroic rocks.