Contains  crystalline silica: a warning not to breathe it.
I did some research on silica dust: Cancer Studies in Humans<br />Exposure of workers to respirable crystalline silica is associated with<br />elevated rates of lung cancer. The link between human lung cancer<br />and exposure to respirable crystalline silica was strongest in studies of quarry and granite workers and workers involved in ceramic,<br />pottery, refractory brick, and diatomaceous earth industries. Human<br />cancer risks are associated with exposure to respirable quartz and<br />cristobalite but not to amorphous silica.
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