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- Varieties that are not valid species:
- Carnelian (variety of quartz)
- Chalcedony (cryptocrystalline variety of quartz)
- Chrysolite (gemmy yellow-green forsterite)
- Chrysoprase (green nickel bearing chalcedony)
- Chrysotile (group name - asbestiform serpentine)
- Citrine (yellow variety of quartz)
- Cleveite
- Coltan (short for minerals of the columbite group)
- Crocidolite (asbestiform riebeckite)
- Cymophane (variety of chrysoberyl)
Read more about this topic: List Of Minerals