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CaSO₄ + 2H₂O Incredibly important evaporite with many industrial uses. Plus forms beautiful "gypsum flowers."

CaF₂ Beautiful evaporite mineral in halide family.

KAlSi₃O₈ Better known as Potassium Feldspar (K-Spar), this mineral is common in granite and other felsic igneous rocks.

SiO₂ One of the most common minerals in the Earth's crust, quartz can form beautiful, euheadral crystals that are popular gemstones.

C (carbon) formed in ultra high pressure and temperature conditions. Diamonds have the highest hardness and thermal conductivity of any natural material. Obviously famous as a gemstone as well.