Indigo Gabbro, also known as "Mystic Merlinite," is a dark, fine-grained igneous rock that contains a mixture of plagioclase feldspar, pyroxene, and olivine, along with other minerals. It is known for its deep indigo-blue to black color, often with shiny inclusions and swirling patterns of purple, gray, and white. Indigo Gabbro has a Mohs hardness of 6 to 6.5, making it durable for use in jewelry and decorative carvings. It is primarily found in Madagascar and is popular for its striking appearance, often used for cabochons, beads, and other ornamental pieces.