An Object in which every part is similar to every other in every relevant respect. More precisely, something is a Substance when it has only arbitrary pieces as parts - any parts have properties which are similar to those of the whole. Note that a Substance may nonetheless have physical properties that vary. For example, the temperature, chemical constitution, density, etc. may change from one part to another. An example would be a body of water.
||石棉||Asbestos is a Mineral.|
| ||重晶石||Barite is Barium Sulfate occurring as a mineral.|
| ||鉻鐵礦||A mineral that consists of an oxide of iron and chromium.|
| ||煤||Coal is a black or brownish black solid combustible substance formed by the partial decomposition of vegetable matter without free access of air and under the influence of moisture and often increased pressure and temperature. Coal is a sedimentary rock containing a high proportion of carbon.|
| ||鑽石||Crystalline Carbon that is valued as a gem and used in industrial applications.|
| ||鐵礦||IronOre is a subclass of CompoundSubstance that contains compounds of iron, of which the most common are hematite and limonite. Iron is obtained from smelting iron ores.|
| ||滑石||Talc is a very soft Mineral that is a basic silicate of magnesium.|