2.4" Orthoclase and Aegirine Crystal Cluster - Malawi

Orthoclase is a feldspar mineral with the chemical formula KAlSi₃O₈ and a hardness of 6 - 6.5 on the Mohs hardness scale. It is considered a key component in many igneous rock formations and is one of the most abundant minerals throughout the continental crust. It can form individual crystals, but it is most commonly known for its pink coloration within granite rock. It has many commercial uses, including application in the production of a wide variety of ceramics, and is sometimes used in the manufacturing of glass.

Aegirine is a sodium iron silicate with the chemical formula NaFeSi2O6. It is a member of the pyroxene group and it shares the same crystal structure as augite, but a different chemical composition. It typically forms long, slender crystals that can bear reddish-black, brown, black or greenish colorations.