Riebeckite

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Crystals of black riebeckite in alkaline pegmatite, near %C3%89visa (Corsica, France)

Riebeckite

Riebeckite is a mineral belonging to the amphibole group. It is a silicate mineral that is commonly found in igneous rocks such as granite and syenite. The mineral was named after the German explorer Emil Riebeck.

Properties

Riebeckite typically appears as long, slender prismatic crystals with a glassy luster. It has a dark blue to black color, and its hardness ranges from 5 to 6 on the Mohs scale. The mineral has distinct cleavage and a prismatic crystal habit.

Occurrence

Riebeckite is commonly found in igneous rocks, particularly in alkaline rocks such as syenite and granite. It can also occur in metamorphic rocks that have undergone high-grade metamorphism. The mineral is often associated with other minerals such as feldspar, quartz, and biotite.

Uses

Riebeckite does not have significant industrial uses due to its limited availability and the presence of asbestos fibers in some specimens. However, it is valued by mineral collectors for its unique crystal habit and color.

Health Concerns

Some varieties of riebeckite may contain asbestos fibers, which can pose health risks if inhaled. Asbestos exposure has been linked to respiratory diseases and cancer, so it is important to handle riebeckite specimens with caution and avoid inhaling any dust particles.

See also

• Amphibole
• Silicate minerals