Dust World Health Organization
mineral dusts,such as those containing free crystalline silica (e.g.,as quartz),coal and cementthan or equal to 3 to 1,are classified as "fibres" (WHO,1997).(stannosis); iron oxide (siderosis); talc; graphite; and mica.absorption through the skin,e.g.pentachlorophenol crystals may dissolve in sweat and easily.
For Faceting Quartz Crystal Buy Gemstone,loose stone,colorstone
Classification,Quartz.Location,Bangkok Thailand.Approx.Weight,56.19 Carats.Approx.Dimensions,38.90 x 13.59 x 11.74 mm.Price per Unit,US $ 0.14 per.Contact Us