Assertion: crystalline silica | /r/AtLocation | stone
Facets:
Source sentences:
text: Crystalline silica (silica) is found in sand, stone, concrete and mortar.
text: Crystalline silica is a known carcinogen found in sand, stone and artificial stone.
text: Crystalline silica is a common mineral that is found in materials such as stone, artificial stone, sand, marble, and most commonly - quartz.
text: Crystalline silica is a common mineral that is found in construction materials such as sand, stone, concrete, brick, and mortar.