morión

Morión is a dark brown to nearly black variety of smoky quartz (silicon dioxide, SiO2). It ranges from translucent to opaque, with stones that can display a rich, uniform color. The deep tone is largely due to iron impurities and natural irradiation during formation. Morión is valued as a gemstone for jewelry and carvings, favored for its dramatic dark appearance.

The name derives from the Spanish morión, meaning “black” or “dark.” In gemology, morión is typically regarded as a color variety of smoky quartz, distinguished from lighter gray-brown forms by its higher iron content and stronger saturation. Some sources reserve the term for the darkest specimens.

Physical properties commonly cited for morión include a Mohs hardness of about 7, a refractive index near 1.54–1.55, and a vitreous luster. It has no true cleavage and occurs in the hexagonal quartz crystal system. While crystals can be prismatic, morión is frequently found in massive or coarse crystal aggregates. The color range is mainly dark brown to almost black, with occasional subtle reddish highlights.

Occurrence of morión is widespread in quartz-bearing regions, with notable sources in Brazil (Minas Gerais), Madagascar, and various European and African localities. It forms in pegmatites and hydrothermal veins alongside other varieties of quartz.

Use and care: Morión is used in beads, cabochons, and decorative carvings. Most specimens are natural in color; to care for morión, clean with warm soapy water and a soft brush, and avoid harsh chemicals or ultrasonic cleaners.