INDIGO GABBRO (MERLINITE) SPHERES
Indigo gabbro, also known as "Merlinite", is a mineral conglomerate that is primarily quarried in Madagascar. The typical colors of these basalt rocks are a deep indigo-purple and black. The word "gabbro" refers to a large group of dark, coarse-grained, intrusive igneous rocks that are chemically equivalent to basalt. The rocks can contain a mixture of feldspar, chlorite, serpentine, muscovite, pyroxene, hercynite and magnetite within in a charcoal colored matrix.
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