Apophyllite is a mineral that has various synonyms such as Mordenite, Heulandite, Stilbite, and Prehnite. Mordenite is a zeolite mineral that is usually white or colorless, and it is found in lava rocks. Heulandite, on the other hand, is a mineral that is often found in cavities in volcanic rocks. It is white or pinkish in color and has a glassy luster. Stilbite, also known as Desmine, is a mineral that is usually pink or white and is found in volcanic rocks. Prehnite is a mineral that is greenish-yellow in color and is typically found in basalts and metamorphic rocks. All these synonyms refer to minerals that are commonly found in volcanic and metamorphic rocks.