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Quick Answer. Non-metallic minerals are minerals that have no metallic luster and break easily. These are also called industrial materials and are typically some form of sediment. Non-metallic minerals are not malleable.
Boron is a semi-metallic element which displays the properties of both metal and non-metal. Boron is the only non-metal of the group 13 of the periodic table elements. At room temperature, it is a poor electrical conductor, but it is a good conductor at high temperatures. 2  It is solid in standard state at 298 Kelvin. 3  It belongs to group 13 in periodic table. 4  Crystalline boron is a very hard, black material with a high melting point of above 2000 Â°C.