This Stone of the Month supplied by Graninter, Porrino, Spain. 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 transparency or an 8- x 10-inch or larger print of any stone material along with ASTM results to Stone of the Month, Stone World, 210 Route 4 East, Suite 311, Paramus, NJ 07652.

Silver Black
country of origin Angola
absorption by weight 0.02%
density 2.83 g/
compressive strength 1.785 kg/
flexural strength 252 kg/
resistance to wearing (abrasion) 0.3 mm
resistance to impact 30-35 cm