Noun
(tourism) Basaltic sand of volcanic origin, frequently found associated with volcanic islands.
(mining) Sand high in magnetite and other iron-rich ferrous minerals, frequently found associated with placer mining.
Used other than figuratively or idiomatically: see black, sand.
Source: en.wiktionary.orgA large wok is filled with black sand and heated to high temperature. Source: Internet
At the end of a ten days' march he reached the summit,—which even in summer was covered with snow,—and from thence, after passing a desert of black sand and burnt rocks, he arrived at a river called Gerj. Source: Internet
Mont Pelée's volcanic ash has created gray and black sand beaches in the north (in particular between Anse Ceron and Anse des Gallets), contrasting markedly from the white sands of Les Salines in the south. Source: Internet
I've swam with sea lions in the Galapagos Islands, walked with lions in Zimbabwe, fed anteaters in Tikal, Guatemala, braved fire ants in Australia, chased a puffin across a black sand beach in Iceland and narrowly avoided stepping on a snake in Burma. Source: Internet
The average high in Santorini is 19ºC in April, which is perfectly warm enough for you to relax on the island’s black sand beaches or by the pool. Source: Internet
The island is fringed on its western and northern coastlines by sandy beaches which are composed of a mixture of white coral sand with brown and black sand which is eroded and washed down from the volcanic rocks that make up the island. Source: Internet