Indigo Gabbro
Igneous rock composed primarily of Plagioclase Feldspar, Pyroxene, and Amphibole (commonly marketed as Gabbro var. Mystic Merlinite) · Decorative Stone and Mineral Specimen
Crystal System
Monoclinic, Triclinic, and Orthorhombic (aggregate rock)
Mineral Group
Silicates (specifically Feldspar and Pyroxene groups)
Chemical Formula
Complex silicate mineral assemblage including (Ca,Na)(Al,Si)4O8 and (Mg,Fe)2Si2O6
Formation Process
Igneous intrusion, formed from the slow cooling and crystallization of molten magma beneath the Earth's surface
About This Crystal
A tumbled and polished gemstone pendant featuring a dark indigo, grey, and black background with striking patches, swirls, and dendrite-like inclusions of lighter minerals, showing a vitreous to waxy luster upon tumbling
Physical Characteristics
Color ranges from dark grey, indigo, to black with white or grey speckling; streak is white; uneven fracture; specific gravity ranges from 2.7 to 3.3 depending on the exact mineral proportions; opaque tenacity
Optical Properties
Biaxial with varying refractive indices depending on constituent mineral grains; generally displays aggregate optical properties without distinct pleochroism in the tumbled state
Hardness & Durability
Origin Region
Madagascar and various localities worldwide where mafic intrusive igneous rocks are found
Hardness & Durability
Mohs hardness ranges from 5.5 to 7 depending on the dominant mineral components at the surface; moderate to good durability suitable for gentle jewelry wear
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemical cleaners, ultrasonic cleaners, and prolonged exposure to direct sunlight
Rarity & Value
Common to uncommon as a decorative stone, affordable price range, widely available in polished and tumbled forms with no common artificial enhancements
Special Characteristics
Features striking contrasting patches and dendritic inclusions created by the complex mix of mafic minerals, sometimes exhibiting a subtle chatoyant sheen under specific lighting
Lore & History
Often referred to commercially as Mystic Merlinite, it is associated in modern metaphysical practices with intuition, spiritual awakening, and shadow work, though these represent traditional belief systems rather than scientific claims