This Stone of the Month supplied by Echeguren Slate, San Francisco, CA. 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.

India Sage Green slate

country of origin India
water absorption by weight 1.82%
density 2.36 g/
modulus of rupture (dry) 16 Mpa
modulus of rupture (wet) 13 Mpa
compressive strength (dry) 115 Mpa
compressive strength (wet) 106 Mpa