Melilite is a mineral that belongs to the group of sorosilicates. It is often found in igneous rocks, including volcanic rocks and carbonatites. Melilite is a rare mineral and it is usually associated with minerals such as garnet, pyroxene, and calcite. There are a few synonyms for the word melilite including tristimite, yeatmanite, and okanoganite. These minerals share many physical and chemical properties with melilite, including the same crystal system, the same color, and similar hardness. Synonyms for melilite may be useful in mineralogy and geology fields when referring to rocks containing this mineral.