Diatomaceous earth or diatomite is a naturally occurring, soft, lightweight, and high porosity siliceous sedimentary rock that can be crumbled into a fine.

Diatomite is a chalk-like, soft, friable, very- fine-grained siliceous sedimentary rock that is light in colour (white and yellowish)

Diatomite is a sedimentary rock that consists mainly of micro-amorphous silica that is the siliceous remains of microscopic single algae cell called "Diatom".

What is Diatomite? 
Diatomite is the naturally occurring fossilized remains of diatoms, and the mineral is found in thousands of products used every day.