What is Covellite?


Covellite is a rare copper sulfide mineral that is often found in the United States, Italy, and Germany. It’s primarily used as a gemstone and is popular for its deep indigo-blue color.

Covellite is a striking gemstone that comes in shades of deep indigo-blue. Its unique appearance and color make it a popular choice for jewelry and decorative items, especially beads and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Sulfide
ColorDeep blue to indigo with a metallic luster.
OccurrenceItaly (especially from the Mount Vesuvius area), the USA (Montana), and Peru.
FormationCovellite forms in hydrothermal veins and as a secondary mineral in copper ore deposits.
DiaphaneityTransparent to translucent
Mohs Hardness1.5 - 2.
Specific GravityApproximately 4.6 - 4.8.
Diagnostic PropertiesIndigo-blue, metallic luster.
Chemical CompositionCuS
PleochroismNot observed due to its opacity.
Crystal SystemHexagonal
Optical PropertiesBiaxial (-)
Refractive Index1.450 - 1.708
2V angleMeasured: 68°
DispersionNot applicable due to its opacity.