Silicosis overview

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Silica

Silica is the second most common mineral on earth. It is found in sand, many rocks such as granite, sandstone, flint and slate, and in some coal and metallic ores. The cutting, breaking, crushing, drilling, grinding, or abrasive blasting of these materials may produce fine silica dust. It can also be in soil, mortar, plaster, and shingles. Silicosis is due to deposition of fine dust (less than 1 micrometre in diameter) containing crystalline silicon dioxide in the form of alpha-quartz, cristobalite, or tridymite.

The induction period between initial silica exposure and development of radiographically detectable nodular silicosis is usually 10 years. Shorter induction periods are associated with heavy exposures, and acute silicosis may develop within 6 months to 2 years following massive silica exposure.

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