Silicon dioxide, SiO?. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder.

a form of silicon that occurs as quartz sand in Florida scrub.

Absorbent, anti-caking, abrasive.

As used in water chemistry, a collective term encompassing dissolved, undissolved, and colloidal silica. In undissolved form, it exists as minute particulate and as encapsulated silica. In dissolved form, it can appear as a silicate, silicon dioxide and as silicic acid

Except in a few sections, this impurity in the boiler water is not troublesome.

an element required for the proper functioning of the enzyme prolyhydroxylase

A scale-forming element found in some boiler feedwaters.

(Si) - Used by photoplankton diatoms. Measured in mg/L or ppm.

a white or colorless chemical compound and nutrient used by diatoms to form outer shell.

A white or colourless crystalline compound which makes up the structure of a fossil.