Riverstone phyllite

Country of origin: Argentina

Real density: 2,775 kg/cu.m

Total porosity: 0.04%

Open porosity: 1.4%

Flexural strength: 89 Mpa

Slip resistance (polished): 54/52 (dry/wet)

Slip resistance (honed): 59/41 (dry/wet)

Slip resistance (riven): 57/51 (dry/wet)

This Stone of the Month supplied by SSQ Group, London, England. Technical details provide a frame of reference only. Because stone is a product of nature, testing to determine specific physical qualities should be repeated for each project. To submit your own Stone of the Month, send a high-resolution digital image along with ASTM results to Stone of the Month,Stone World, 210 Route 4 East, Suite 311, Paramus, NJ 07652.