👉 The term "phenakite" is an English word that refers to a type of mineral that occurs in the Earth's crust. It is typically composed of two different minerals, namely beryllium and aluminium. Beryllium is a silvery-white metal with a hardness of around 7-8 on the Mohs scale, while aluminium is a light metal with a high melting point. Phenakite is known for its unique properties such as its high thermal conductivity and electrical resistance