Adelite

Adelite is a mineral that belongs to the apatite group. Its chemical formula is CaMg(AsO4)(OH), and it typically occurs as small, transparent to translucent green, yellow, or brown crystals. Adelite was first discovered in 1866 in the Raura District of Peru and was named after the French mineralogist, Adel Boutan.

Adelite is a secondary mineral that forms in oxidized zones of hydrothermal mineral deposits. It is often found associated with other minerals such as quartz, pyrite, and sphalerite. Adelite is sometimes used as a minor ore of arsenic and magnesium, but it is primarily valued as a collector's mineral due to its attractive crystal forms and colors.