Black Spinel 4mm Natural Round - 15-16 Inch Stone Type_Indigo Gabbro manganese and other metallic oxides

manganese and other metallic oxides captured during the forming of the rock

near the Kennedy Ranges of Australia

Rutilated Quartz is a silicon dioxide mineral with unique needle to like inclusions of Rutile

Distinctive for its purple-and-gray tones

Black Spinel 4mm Natural Round - 15-16 Inch Stone Type_Indigo Gabbro manganese and other metallic oxidesSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.