Spessartine (Spessartite) Garnet Group - Mn3Al2Si3O12 - Manganese aluminium silicate. Gemmy, with heavy striations of nice ruby red color which can be seen under transmitted light . Mounted on its own plastic base. Crystal size 5/8"h x 3/4"w x 1/2"d. Weight 0.3 oz. From Galilea, Brazil.