https://en.wikipedia.org/wiki/Silicosis
Compiling notes on affordable detection of silica:
- http://www.mendeley.com/research/light-scattering-turbidimetric-detection-silica-colloids-size-exclusion-chromatography/
- http://www.jstor.org/discover/10.2307/2442818?uid=3739568&uid=2&uid=4&uid=3739256&sid=21102692479477
- http://www.alibaba.com/product-tp/109084150/Silica_detection_test_kit.html