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Table 1 Particle size distribution. The size distribution of the particles was determined by coulter counter analysis and is presented as percent particles in the size ranges < 1, 1–2.5, 2.5–5, 5–10 and > 10 μm

From: Respirable stone particles differ in their ability to induce cytotoxicity and pro-inflammatory responses in cell models of the human airways

Diameter (μm) Quartzite Anorthosite Rhomb porphyry Dacite Quartz diorite Hornfels α-quartz
< 1 0.5 4.1 4.7 2.7 1.4 7.1 4.5
1–2.5 24.2 26.0 36.0 32.1 30.5 43.4 43.6
2.5–5 29.7 30.7 33.6 32.7 33.2 32.8 40.0
5–10 37.9 34.6 25.0 30.6 32.8 16.6 11.9
> 10 7.6 4.7 0.8 2.1 2.2 0.0 0.0