Natural Substances or Materials

Natural Substances or Materials: substances formed through a natural geological genetic process, inorganic, within the Lithosphere, without any human intervention, possessing well-defined chemical, physical, and mineralogical constants. Example: Mineral species such as Corundum (in its varieties Ruby, Sapphire, and various colors), Beryl (in its varieties Emerald, Aquamarine, Heliodor, etc.), Tourmaline, Topaz, Spinel, etc.

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