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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.
Some of the nonmetals are gasses at room temperature, some are solids, one (bromine) is a liquid. Unlike metals, some of the nonmetals exist as distinct molecules. Nonmetals generally form negative ions. Metalloids have properties of both metals and nonmetals and do not fit neatly into either category.They are often lustrous like metals but tend to be brittle like nonmetals. metalloids are classified as semiconductors as they have a moderate ability to conduct heat and electricity. They are solid at room temperature..onmetals generally form negative ions. Metalloids have properties of both metals and nonmetals and do not fit neatly into either category. They are often lustrous like metals but tend to be brittle like nonmetals.