Salt, magnesium oxide (magnesia), calcium chloride, alumina, silica, Silicon carbide, zirconium oxide, tungsten carbide, boron carbide.
Characterized by having high melting / boiling point, brittleness, high hardness. Crystalline solids.
Covalent:
Any plastics will do: Polyethylene, polypropylene, ABS
Any other organic compounds: ethanol, ethylene, wax etc.
Diamond
Solids, liquids and gases with lower melting/boiling points, typically softer and tougher. Thermal and electrical insulators
Metallic:
Try some metals: Iron, Zinc, Aluminum, Titanium, Copper. Thermal and electrical conductors, malleable and ductile
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