Sylvite is a mineral that is commonly known as potassium chloride, which is an important substance for agricultural and industrial applications. Some synonyms for sylvite include Sylvina, potash mica, and muriate of potash. Sylvina is a rarer form of sylvite, which contains more silver than the original mineral. Potash mica, on the other hand, is a variant of mica that is rich in potassium. Meanwhile, muriate of potash refers to a compound that is composed of sylvite and other chlorides. These synonyms are often used interchangeably with sylvite, depending on their specific properties and uses.