How does this silica (Diatomaceous Earth) differ from that found in sand?  I know that can be hazardous.
Thanks,
Betty

Answer:

Hi Betty,
 
The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica (silicon dioxide, or SiO2), usually in the form of
quartz, which, because of its chemical inertness and considerable hardness, is resistant to weathering.

Diatomaceous earth consists of fossilized remains of diatoms, a type of hard-shelled algae. Diatomite forms from the remains of water-borne diatoms, it is found close to
either current or former bodies of water. It is generally divided into two categories based upon source: freshwater and saltwater. Freshwater diatomite is mined from
dry lakebeds and is characteristically low in crystalline silica content. Saltwater diatomite contains a high crystalline silica content, making it a useful material
for filters, due to the sieve-like features of the crystals.
 
http://en.wikipedia.org/wiki/Diatomaceous_earth
http://www.diatomiteusa.com/
http://www.ghorganics.com/DiatomaceousEarth.html
http://www.whiteearth.ca/de.htm
 
 
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Safety considerations
The absorbent qualities of diatomite can result in a significant drying of the hands, if handled without gloves. The saltwater (industrial) form contains a highly crystalline form of silica, resulting in sharp edges. The sharpness of this version of the material makes it dangerous to breathe and a dust mask is recommended when working with it.

The type of hazard posed by inhalation depends on the form of the silica. Crystalline silica poses a serious inhalation hazard because it can cause silicosis. Amorphous silica can cause dusty lungs, but does not carry the same degree of risk as crystalline silica. Food-grade diatomite generally contains very low percentages of crystalline silica. Diatomite produced for pool filters is treated with heat, causing the formerly amorphous silicon dioxide to assume its crystalline form.

In the United States, the crystalline silica content in the dusts is regulated by the Occupational Safety and Health Administration (OSHA), and there are guidelines for the maximum amounts allowable in the product and in the air near the breathing zone of workers.

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Craig