allikite

Allikite is a rare mineral with the chemical formula Na2Ca2(CO3)3F2. It was first discovered in 1962 in the Khibiny Massif, Kola Peninsula, Russia, and is named after the Allik River, which flows through the area. Allikite is typically found in carbonatite rocks, which are igneous rocks rich in carbonate minerals. It is a member of the natrolite group, which includes minerals with similar structures and compositions.

Allikite crystals are usually colorless or white, but they can also be pink, yellow, or brown due to impurities. They are typically prismatic or tabular in shape, with a perfect cleavage in one direction. Allikite has a Mohs hardness of 4.5 and a specific gravity of 2.8 to 2.9. It is transparent to translucent and has a vitreous luster.

Allikite is not commonly used in jewelry or industry due to its rarity and the fact that it is not particularly hard or durable. However, it is of interest to mineral collectors and researchers due to its unique composition and crystal structure. It is also used in some scientific studies to understand the behavior of carbonate minerals in geological processes.