Diatomaceous earth :Silica shell of dead diatoms are nearly indestructible and thus, get accumulated at the sea bed. Such huge rock like deposits of hard shell of diatoms constitutes earth, which is mined to obtain a whitish powder called diatomites or Kieselguhr.
Diatomites are rough and gritty. Because of these features, it is used in filters in brewing industry, sugarcane refineries, in metal polishing, toothpaste, for making insulating bricks, water glass or sodium silicates and strong acids.
This is added to paints to increase their night visibility. The common example of diatoms are Triceratium, Pleurosigma, Navicula, Cymbella.
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