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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.
The line that separates metalloids from nonmetals in the periodic table is referred to as the amphoteric line.[citation needed] There is no rigorous definition of the term, but the following properties are usually considered characteristic of metalloids: metalloids often form amphoteric oxides.est Answer: non-metals do not conduct electricty at all metals-conduct is well metalloid is more complicated: Metalloid is a term used in chemistry when classifying the chemical elements. The term semimetal is sometimes used synonymously, but this is sometimes defined differently.