Commonly found preserved in ash layers, pottery, and on stone tools and even teeth, minute particles of silica derived from plant cells that survive after the rest of the organism is decomposed are known

Phytoliths

Explanation:

A Phytoliths is a rigid microscopic structure made of silica and is found in planet tissues and persist after the decay and decomposition of plants and is found in the extracellular structure of the plants and also refers to the minerals leftover by the plants.