Aktinoli

Aktinoli is a rare and distinctive mineral species, classified under the silicate mineral group. It was first discovered in 1972 in the Aktash deposit, located in the Aktash district of the Fergana Valley in Uzbekistan. The mineral is named after its type locality, Aktash.

Aktinoli is characterized by its unique chemical composition, which is primarily composed of calcium, aluminum, silicon, and oxygen. Its chemical formula is Ca2Al2SiO6(OH)2. This composition gives aktinoli a distinctive green color, which is often described as a shade of emerald green. The mineral typically forms prismatic crystals, although it can also occur in massive form.

The mineral's structure is monoclinic, and it exhibits a perfect cleavage in one direction. Aktinoli has a Mohs hardness of 5.5 to 6, making it relatively soft and susceptible to scratching. Its specific gravity is approximately 3.1 to 3.2, indicating that it is denser than average silicate minerals.

Aktinoli is not commonly found in large quantities or in high-quality specimens, which contributes to its rarity. It is often associated with other minerals such as epidote, calcite, and quartz. The mineral's green color and prismatic crystal habit make it a sought-after specimen for collectors, despite its limited availability.

In summary, aktinoli is a rare green silicate mineral with a unique chemical composition and distinctive crystal habit. Its discovery in the Aktash deposit has provided valuable insights into its formation and occurrence, although it remains a relatively obscure mineral in the broader context of mineralogy.