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A semimetal or a metalloid is a chemical element. Metalliods are elements that have the propeteries of both metal and non-metal elements. It might be shiny, but brittle. It might be dull, but conducts electricity. It might be very hard, but shiny.

The most common semimetal is silicon. Silicon has electrical conductivity between metals and nonmetals. It is a semiconductor.

An approximate way to classify metalloids is to look at the Periodic Table of elements. See the double diagonal line: top left Boron and Aluminium, bottom right Polonium and Astatine. Those diagonals are the metalloids.

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