Minerals, mines, 3 types. The types are unknown, but I searched using image search, so please use it as a reference. Left: This is a natural stone called aventurine (sunstone/goldstone). Middle: This is amethyst, a mineral with the Japanese name "Hōkaiseki" (calcite) and the English name "Calcite". Right: Amethyst is purple quartz. The case has a crack, but I will send it as is.