From Wikipedia: Native element minerals are those elements that occur in nature in uncombined form with a distinct mineral structure. The elemental class includes metals and intermetallic elements, semi-metals and non-metals. This group also includes natural alloys, phosphides, silicides, nitrides and carbides.
Examples above include: gold, sulphur, copper, diamond, and silver.
There are 32 elements (18 metals, 5 nonmetals and gases) that can be found in nature in their elemental form. Metals give a metallic luster on their polished sides, as do some nonmetal and semimetal minerals.