Diatomite pneumoconiosis

Oechsli WR, Jacobson G, Brodeur AE Diatomite pneumoconiosis Roentgen characteristics and classification. Am J Roentgenol Radium Ther Nucl Med 85 263-270, 1961... 

Silicon toxicity is virtually limited to occupational exposure to silicon compounds e.g. miners, sandblasters, bricklayers, pottery workers in which inhalation of the compounds has been associated with the diseases of the lung. The later being evidenced by nodule formation and acute silicosis, mixed dust fibrosis and diatomite pneumoconiosis. 

Cooper WC, Cralley LJ Pneumoconiosis in Diatomite Mining and Processing. Public Health Services Pub No 601. Washington, DC, Government Printing Office, 1958... 

---