Close Up - Inorganic Subject

An image which displays detail not usually observable by the human eye of an inorganic subject.

Note - Inorganic materials are generally derived from non-living sources, such as rocks or minerals.   To assist in finding potential subjects for this competition, in addition to the more obvious geological forms in nature, consider detailed observations of, for example, concrete, rust, metals (gold, silver, copper, iron, etc), glass (enamel, beads, volcanic), ceramics (porcelain, stoneware, brick).  

Organic objects, such as wood, plastic, cotton or anything living are not eligible.

Another example, table sugar is organic because it is derived from a plant, but table salt is inorganic.