Description

Aegirine, also known as Acmite, is a sodium iron silicate mineral commonly formed in the alkali-rich volcanic rock. It was discovered in 1835 in Norway and got its name from Ægir, the Scandinavian god of the sea. Aegirine has been seen as black, dark green, or brown and can be found in Russia, Canada, South Africa, and the U.S.A.

Feldspars are a group of rock-forming tectosilicate group of minerals containing potassium, sodium, calcium and aluminium silicatesminerals that make up as much as 60% of the Earth’s crust.  They are the most common rock-forming minerals. Feldspars crystallize from magma as veins in both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Feldspars are also found in many types of sedimentary rock.