Light entering the stone from every direction travels through the crystal at the same velocity Chemical composition Garnet group has six species divided into two series based on chemical composition.
All garnets have basically the same structure, but different chemical compositions.
Chemical group for garnet is silicate. All garnets can intermix within and between the two series. Some garnets have no identifiable species and are called just a garnet. Species, varieties, and trade names. Generally the purest red color for a garnet and can be confused with ruby.