Black sand

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Black sand on a beach in Southern Iceland Island Schwarzer Strand 10.JPG
Black sand on a beach in Southern Iceland
Closeup of black sand from a beach in Maui, Hawaii BlackSandMaui.jpg
Closeup of black sand from a beach in Maui, Hawaii
Black sand beach in Waianapanapa Park, Hawaii Hawaii Maui Waianapanapa Park (22028557463).jpg
Black sand beach in Waianapanapa Park, Hawaii
Black sand and icebergs on a beach in Iceland Iceland Diamond Beach.jpg
Black sand and icebergs on a beach in Iceland

Black sand is sand that is black in color. One type of black sand is a heavy, glossy, partly magnetic mixture of usually fine sands containing minerals such as magnetite, found as part of a placer deposit. Another type of black sand, found on beaches near a volcano, consists of tiny fragments of basalt.

Contents

While some beaches are predominantly made of black sand, even other color beaches (e.g. gold and white) can often have deposits of black sand, particularly after storms. Larger waves can sort out sand grains leaving deposits of heavy minerals visible on the surface of erosion escarpments.

Placer deposits

Black sands and gold in sluicebox, Blue Ribbon Mine, Alaska Gold and black sands in sluice.jpg
Black sands and gold in sluicebox, Blue Ribbon Mine, Alaska
Magnet for separation of black sand by hand Magnetic separator hg.jpg
Magnet for separation of black sand by hand

Black sands are used by miners and prospectors to indicate the presence of a placer formation. Placer mining activities produce a concentrate that is composed mostly of black sand. Black sand concentrates often contain additional valuables, other than precious metals: rare earth elements, thorium, titanium, tungsten, zirconium and others are often fractionated during igneous processes into a common mineral-suite that becomes black sands after weathering and erosion.

Several gemstones, such as garnet, topaz, ruby, sapphire, and diamond are found in placers and in the course of placer mining, and sands of these gems are found in black sands and concentrates. Purple or ruby-colored garnet sand often forms a showy surface dressing on ocean beach placers.

An example of a non-volcanic black sand beach is at Langkawi in Malaysia. [1]

Basalt fragments

Black sand forming when lava hits ocean. Kilauea volcano. Black Sand Forming.jpg
Black sand forming when lava hits ocean. Kīlauea volcano.

When lava contacts water, it cools rapidly and shatters into sand and fragmented debris of various size. Much of the debris is small enough to be considered sand. A large lava flow entering an ocean may produce enough basalt fragments to build a new black sand beach almost overnight. The famous "black sand" beaches of Hawaii, such as Punaluʻu Beach and Kehena Beach, were created virtually instantaneously by the violent interaction between hot lava and sea water. [2] Since a black sand beach is made by a lava flow in a one time event, they tend to be rather short lived since sands do not get replenished if currents or storms wash sand into deeper water. For this reason, the state of Hawaii has made it illegal to remove black sand from its beaches. Further, a black sand beach is vulnerable to being inundated by future lava flows, as was the case for Hawaiʻi's Kaimū, usually known simply as Black Sand Beach, and Kalapana beaches. [3] An even shorter-lived black sand beach was Kamoamoa. [4] Unlike with white and green sand beaches, walking barefoot on black sand can result in burns, as the black sand absorbs more solar radiation. [5]

Beaches

Black sand has formed beaches in places including: [6] [7] [8]

Europe

Africa

North America

Central America

Caribbean

  • Grand Anse beach, Basse-Terre
  • Barceloneta, Machuca's Garden
  • Playa Negra in Vieques
  • Cocolandia, Palenque Beach, San Cristóbal
  • Baní Sand Dunes, Peravia, Baní
  • Black Stone Beach, Santa Cruz, Aruba

Asia

North Atlantic

North Pacific

South Pacific

Indian Ocean

See also

Related Research Articles

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<span class="mw-page-title-main">Placer deposit</span>

In geology, a placer deposit or placer is an accumulation of valuable minerals formed by gravity separation from a specific source rock during sedimentary processes. The name is from the Spanish word placer, meaning "alluvial sand". Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers.

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Punaluʻu Beach is a beach between Pāhala and Nāʻālehu on the Big Island of the U.S. state of Hawaii. The beach has black sand made of basalt and created by lava flowing into the ocean which explodes as it reaches the ocean and cools. This volcanic activity is in the Hawaiʻi Volcanoes National Park. Punaluʻu is frequented by endangered hawksbill and green turtles, which can often be seen basking on the black sand.

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References

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