[source]

Labradorite is a Feldspar mineral of the plagioclase series that is most often found in mafic igneous rocks such as Basalt, Gabbro, and Norite. It is also found in Anorthosite, an igneous rock in which Labradorite can be the most abundant mineral.

Nuummite is a rare metamorphic rock, consisting of the minerals Gedrite and Anthophyllite, which form lamellae that give the rock its typical iridescence. Usually black in colour and opaque, Nuummite is named after the area of Nuuk in Greenland, where it was found.