Indigo Gabbro

Gabbro refers to a group of coarse-grained igneous rock made mainly of Quartz and Feldspar, and Indigo Gabbro is a special form that has a certain colouration. Indigo Gabbro is also known by the trade name Mystic Merlinite (not to be confused with Merlinite, which is a trade name for Dendritic Opal), and this variety of Gabbro can be found in Madagascar and Alaska.