Ankinovichite is a mineral that belongs to the amphibole group. It is an inosilicate mineral that crystallizes in the monoclinic system. The name “ankinovichite” is derived from its chemical composition, which includes the elements sodium (Na), calcium (Ca), magnesium (Mg), iron (Fe), aluminum (Al), silicon (Si), oxygen (O), and hydrogen (H).
Ankinovichite typically occurs as thin, elongated prismatic crystals or fibrous aggregates. It exhibits a greenish-gray, grayish-green, or greenish-black coloration and possesses a vitreous to silky luster. The mineral is translucent to opaque and is characterized by its perfect cleavage in two directions. Its hardness on the Mohs scale is approximately 5-6.
Ankinovichite is commonly found in metamorphic rocks, particularly those formed in high-pressure and low-temperature environments. It is associated with minerals such as glaucophane, epidote, quartz, garnet, and others.
Due to its composition and structure, ankinovichite is often used as an indicator of regional metamorphism. It has been found in various locations worldwide, including Russia, China, Afghanistan, Canada, and the United States.
In summary, ankinovichite is a greenish-gray to greenish-black mineral belonging to the amphibole group. It is characterized by its elongated prismatic crystals, vitreous to silky luster, and perfect cleavage. It is commonly found in metamorphic rocks and serves as an indicator of regional metamorphism.
