Materials
The matter from which a thing is or can be made, materials are the physical stuff which makes up the universe.
Natural Materials
Materials which are common or uncommon in natural amounts as created by natural processes of the universe itself. Natural materials are identical to those found in the periodic table normally.
Structol: A living metal, structol is cultured and modified to perform a wide variety of tasks on the molecular level. It is usually modified so it cannot reproduce 'greedily' by forcing it on some level to be dependant on a rare material not found in most environments on a meaningful level. Often used in armor and self-modifying circuitry. Toxic to ingest in many cases, though not always.
Artificial materials
Materials with properties not found naturally in nature, meta-materials must be especially engineered to achieve their function.
Not technically matter at all, these 'materials' are parts of structures either temporary or permanent.
Hard-light: An artificial atom with a nucleus made up of photons rather than protons and neutrons, hard-light is almost massless and can act as an electromagnetic circuit. It is often used to create shape-changing high-power antennae that would usually be crushed with their own sheer force exertion or programmable structures and is dependant on a projector to be maintained. Disconnected from a projector, hard-light decays relatively quickly.
Exotic Materials
Naturally found or formed through processes (no matter how extreme) in nature, natural materials can be harvested and grown through accelerated processes which are performed artificially. Some types of natural materials occurred in circumstances so violent or incredible that they cannot be replicated artificially in meaningful amounts.
Some exotic materials are known to violate known laws of physics (requiring other models thus to predict their behavior for them to be useful). Others are theorized and have not yet been encountered, some are exotic states of other materials and other still are materials with dramatic changes in physical or chemical processes due to unusual conditions.
Sheoul: A form of Unbiseptium-128 isotope, sheoul is bonded in a hexakaidecagon 16-pair-bond with other Unbiseptium-128 in the same position across higher dimensional space to become a stable form of matter. Incredibly dense, its monopole induced isomorhic decay triggers unusual space-time behavior caused by the presence of weyl fermions and aeons. These fermions also allow for the function of an ultra-efficient type of computer that does not use electrons.