chemical with specified structure crystalline silica 2023-11-09T10:09:39Z CHEBI:30563 CHEBI:46727 FSD FSP MESH:D011791 MESH:D012822 This is any condition in which the main influencing factor is crystalline silica. Silica is synonymous with silicon dioxide (SiO2) and commonly found in nature as sand. Silica exists mainly as crystalline silica (mostly in the form of quartz). XCO:0001098 experimental_condition_ontology fracking sand dust fracking sand particles respirable crystalline silica slaulederkind