<https://www.matterofstuff.com/product_4033>
<http://schema.org/description>
"Black Stone has a very particular colour, typically black that tends towards shades of blue, it also features different shades of grey as well as fossils, crinoids and white shells.\r\n\r\nThis stone is hard, solid and durable, suitable for indoor and outdoor use.\r\n\r\nBlack Stone can be cut in very thin thicknesses."
<https://www.matterofstuff.com/materialtags/marble-and-stones-finishes/textured>