SILICA IN THE WORKPLACE
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365-AXJ-01-iGDO © 2020, Workplace Safety & Prevention Services (WSPS)
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Figure 1
Interrelationships between Forms of Silica
SILICA
Free
Silica
Cristobalite
Silica
Fused
Silica
*Amorphous
Silica
Combined
Silica
diatomaceous earth
silica gel
fused silica
precipitated silica
quartz
cristobalite
tridymite
tripoli
coesite
flint
chert
jasper
chalcedony
(a mixture of crystalline
and amorphous silica)
conversion induced by heating
*NOTE: Commercially available products may contain appreciable quantities of crystalline silica. Obtain
written confirmation of the analysis from the manufacturer or supplier to determine whether or not the
Designated Substance Regulation applies.
