Genshi

Genshi (原子; lit. "Physical Particles" or "Atom") is the main component of all physical states of matter in the universe. The Genshi is said to be the smallest, observe-able physical unit of measurement, and serves as the basic building block to all structural, physical objects in the universe. it's noted to be adjacent to Reishi, although a tad larger, and thus able to have spiritual signatures or material mixed or stored within.

Overview
Unlike Reishi, Genshi actually quite observe-able. It was discovered in the 223rd Age, by the famed blacksmith and scholar, Bato Mamosuto. With this knowledge, the craftsmen eventually went on to develop many theories - each eventually leading to the discovery of the true nature of genshi. At the heart of it, a particle of Genshi create all other forms of atomic particles, and can work in tandem with reishi as well. As it's the larger of the two, reishi can often be found stored within a particle of reishi, allowing inanimate objects to possess reservoirs of energy.

Characteristics
As mentioned, genshi is one of the smallest measurements of matter in the world - second only to it's spiritual equivalent, Reishi. It serves as the basic fundamental block to all states of matter. As a result, all phenomenons, such as friction, heat, roughness, durability, and even the biological constructs known as cells are a byproduct of these microscopic materials. Given that it's larger than reishi, this building block can even contain the substance, allowing it's properties to potentially be manipulated via spiritual means.

It's for this reason that things suchTas chakra can manipulate or modify the physical world.

The different properties found in nature are simply spawned from the varied combinations of genshi that occur on a sub-atomic level. If one were to gain the ability to manipulate genshi itself, the amount of different matter able to be developed would be near limitless.