central heating - a heating system in which air or water is heated at a central furnace and sent through the building via vents or pipes and radiators
exists and is an alternate of . Five physical characteristics of a mineral are: hardness, luster, diaphaneity, colour, and streak.
Diamonds are nevertheless classified as minerals, because they adhere to the five core characteristics of minerals. In addition to being formed by a natural process, minerals are stable at room temperature. This simply means that all minerals are solid at normal temperatures and pressures common on the Earthâs surface. This characteristic excludes water from being a mineral because of its liquid state but includes the solid form of water â ice â as a valid mineral. Minerals are also represented by a chemical composition or atomic structure. Minerals all share a uniquely orderly internal order.