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What is Sand? Formation, Beaches, Composition and Uses

Updated on January 29, 2017

Sand is composed of loose pieces of rocks, minerals and soil particles. Sand is found in beaches, lakes, rivers, bottom of oceans and desserts.

The constant weathering of land forms such as mountains and hills by natural forces such as rain, wind and ice over millions of years has lead to the formation of sand.

Sand is granular in texture. An individual particle of sand is called a grain. Grains of sand can be rounded or angular in shape.They range from 1.6 mm to 2 mm in size.The color of the sand grains depends upon the geographical location and the environmental conditions of the surrounding place.

Formation of sand

Sand formation starts when a landmass breaks down to form rocks. These rocks are further broken down into smaller and smaller pieces by nature's forces to form sand. Sand formation through natural forces can take anywhere from hundreds to millions of years.

The breaking down of rocks into smaller pieces by forces of nature is called weathering. Sand is the result of mechanical, chemical and biological weathering that has occurred for over million of years.

Mechanical weathering

Mechanical weathering is weathering that occurs due to the forces of the wind, water and extreme changes in temperature. Rainwater that seeps into cracks and crevices of rocks turns into ice when the temperature falls below zero degrees centigrade.

When the surrounding temperature increases the ice thaws. Over time, the freezing and thawing process causes the rocks to break apart into smaller pieces. These smaller pieces are broken into more tiny pieces to form grains of sand.

In deserts, there are extreme changes in temperatures. During the day, the temperatures are very high and in the night, it becomes very cold. The constant heating and cooling of rocks weaken them and over time they break down into smaller fragments.

Mechanical weathering also occurs when the strong winds constantly hit against rocks and boulders causing them to break apart.

Roots of trees growing in the sides of mountains penetrate deep and cause cracks in the rocks. These cracks become wider when the rainwater collects and freezes to form ice.

Chemical weathering

Chemical weathering weakens the rocks and aids in the process of disintegration through chemical reactions.

Water combines with carbon dioxide and forms carbonic acid; this carbonic acid dissolves the rocks causing them to weaken and break down. Temperature and moisture play an important role in chemical weathering.

Biological Weathering

Biological weathering is weathering that occurs due to the activity of plants and animals.

For example, lichens release chemicals that weaken the rocks. These weakened rocks can easily be broken down by forces of nature into smaller pieces.

Roots of trees that grow on the mountainside can cause cracks to develop in the rocks, this can be considered as biological weathering because it is caused by the growth of the plant roots.

Formation of sand is the result of all three types of weathering - mechanical, chemical and biological weathering.

Composition of Sand

The composition of sand depends on the rocks present in the region and environmental conditions of the place. The color of sand depends on what the sand is made of and varies according to the composition.

Beach sand is made up of pebbles, shells, and small stones. Most of the beaches around the world are made of minerals like quartz and feldspar.

Quartz is made from silicon dioxide and Feldspar is made of sodium, calcium, or potassium along with quartz.

Quartz is found in abundance in beaches because they are hard and can survive weathering. Quartz can be broken down into smaller pieces but they do not easily dissolve and disappear because they are strong and resistant to chemical reactions.

Other than calcium and feldspar mica flakes can also be seen in beach sands.

The color of sand depends on what the sand is made of and varies according to the composition.

Presenting different colored sands around the world -

Black Sand Beach - Alaska
Black Sand Beach - Alaska | Source

Black Sand Beaches

Black sand beaches are composed of volcanic minerals and lava fragments. These beaches are black in color because the volcanic minerals and rocks are in hues and shades of the color, black.

The minerals that give the dark color to the sand are pyroxenes, amphiboles, and iron oxides. Black sands are heavier than the light brown colored sand and become very hot on a sunny day.

Many black sand beaches are found in Hawaii - Pololu Valley Beach and Kehena Beach, Honokalani Black Sand Beach

Other Black Sand Beaches - Vik Beach in Iceland, Prince William Sound, Alaska.

White Gypsum Dunes of the White Sand National Monument in New Mexico
White Gypsum Dunes of the White Sand National Monument in New Mexico | Source

The White Sands National Monument in New Mexico

The White Sands National Monument in New Mexico has about 275 square miles of white sand dunes that are made of gypsum that has been broken down over millions of years. The broken down Gypsum gives the white color to the sand.

According to the New Mexico New Port, a student journalism lab at the University of New Mexico the white sands are the remnants of a lake called Lake Lucero that existed a million of years ago.

Gypsum was produced at a faster rate than the water in the lake could dissolve and due to this reason layers of gypsum were left behind as the water evaporated.

The force of wind broke down large pieces of Gypsum into Selenite (broken down pieces of Gypsum are known as Selenite).

The original Selenite that was formed had a clear surface but over time, Selenite was eroded by the wind and developed many cracks. It is the reflection of light through these cracks that makes the sand look white.

Other white sand beaches around the world – White Beach Boracay in the Philippines, The Maldives in the Indian Ocean, Wine Glass Bay in Tasmania, Grand Anse Beach in Seychelles.

Puu Mahana Beach Hawaii
Puu Mahana Beach Hawaii | Source
Olivine sand pebbles collected near the Southern Tip of Hawaii
Olivine sand pebbles collected near the Southern Tip of Hawaii | Source

Papakolea Green Sand Beach

Papakolea Green Sand Beach also known as Puu Mahana Beach in Big Island, Hawaii is surrounded by cliffs that are olive green in color. The sand on the beach is due to constant erosion of a volcanic cinder cone called Diamond Head in Oahu, close to the beach.

The sand is composed of basaltic lava that is rich in a mineral called Olivine. Olivine is green in color and lends the shade of green to the sand.

Red Sand Beach, Rabida Island Galapagos
Red Sand Beach, Rabida Island Galapagos | Source

Red Sand Beaches

Red sand beaches can be found in Hawaii, USA, Rabida Island, Galapagos and Santorini, Greece.

The sands in Rabida Island Galapagos is red due to the oxidation of iron-rich lava deposits and coral sediments that have been washed ashore.

The red color of the Red Sand Beach in Santorini is due to the erosion of the surrounding cliffs that are made of red color sedimentary rocks.

Kaihalulu Beach sand in Hawaii is blackish- red in color because of the erosion of the cinder cone called Ka’uiki Head on the Northern end of the cove.

Uses of Sand

Sand is an important component of building materials such as mortar, cement, asphalt, paving, plaster and concrete. Sand is added to building materials to make them harder to bear more weight.

Pure quartz sand is used in pottery and glass making industries, to line the hearth of acid-steel furnaces because quartz sand can withstand high temperatures.

Sand is also used for the following -

  • as a filter to purify water
  • glued to paper to make sand paper
  • it is used as a sandblast to clean walls of buildings

Sand is formed by erosion of land masses over millions of years. The composition of sand depends upon the place where it is found. Sand has many uses and plays a significant role in the construction industry.

References

http://www.sandatlas.org/sand/

http://education.nationalgeographic.org/encyclopedia/weathering/

http://coastalcare.org/educate/beach-basics/

http://geomaps.wr.usgs.gov/parks/misc/glossaryb.html#basalt

http://www.soil-net.com/dev/

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    • billybuc profile image

      Bill Holland 16 months ago from Olympia, WA

      I love articles like this one about stuff we always see but never really know much about. Great information here...thank you!

    • Vellur profile image
      Author

      Nithya Venkat 16 months ago from Dubai

      billybuc thank you, that is true we never think about sand and wonder what it actually is.

    • always exploring profile image

      Ruby Jean Fuller 16 months ago from Southern Illinois

      Interesting. I have never seen red or black sand. I love write sand.

    • whonunuwho profile image

      whonunuwho 16 months ago from United States

      Interesting work my friend. Much more about sand than one realizes.Thanks for sharing. whonu

    • DDE profile image

      Devika Primić 16 months ago from Dubrovnik, Croatia

      Wow! The pebbles are beautiful. Interesting facts indeed!

    • Vellur profile image
      Author

      Nithya Venkat 16 months ago from Dubai

      always exploring white sand looks great, thank you for your visit.

      whounuwho thank you and yes sand is interesting to study in detail.

      DDE thank you and yes they are so beautiful.

    • AliciaC profile image

      Linda Crampton 16 months ago from British Columbia, Canada

      I love the photos and information about sand of unusual colour. I've seen black sand in real life, but I've never seen red, green or white sand. All of these colours look beautiful!

    • FlourishAnyway profile image

      FlourishAnyway 16 months ago from USA

      Fascinating stuff here! I enjoyed learning where all the different colors of sand can be found and why they are the colors they are.

    • Vellur profile image
      Author

      Nithya Venkat 16 months ago from Dubai

      FlourishAnyway thank you, the colors are amazing.

    • Nell Rose profile image

      Nell Rose 16 months ago from England

      Well I never knew that! Green sand! how amazing! And we also have red sand here in England! In a seaside resort called Paignton, I went there a few years ago. Amazing colors, fascinating hub! shared!

    • Vellur profile image
      Author

      Nithya Venkat 16 months ago from Dubai

      Nell Rose thank you for your visit and share. The green sand looks amazing!

    • Jackie Lynnley profile image

      Jackie Lynnley 16 months ago from The Beautiful South

      So interesting Nithya! I guess it never entered this pea brain that sand came from rock and it is as logical as can be! I will certainly be comparing beaches to the rocks from now on! Thanks for the education! +

    • Vellur profile image
      Author

      Nithya Venkat 16 months ago from Dubai

      Jackie Lynnley thank for your visit and am glad you found this interesting.

    • rajan jolly profile image

      Rajan Singh Jolly 15 months ago from From Mumbai, presently in Jalandhar,INDIA.

      Very informative and extremely interesting read. I'm mesmerized by the various colors of sand. Lovely photos as well and well written. Sharing this hub.

    • Vellur profile image
      Author

      Nithya Venkat 15 months ago from Dubai

      rajan jolly thank you and yes the colors of the sand are mesmerizing.

    • Nell Rose profile image

      Nell Rose 15 months ago from England

      Hiya, just came back to share! wonderful hub!

    • Vellur profile image
      Author

      Nithya Venkat 15 months ago from Dubai

      Nell Rose thank you for the visit and share, much appreciated.

    • profile image

      Surabhi Kaura 15 months ago

      This is a very informative hub, Nithya. Nature is so beautiful. We as humans have a duty to preserve it, but alas! Loved the photos, my Sweet. They are truly gracious. Much Love.

    • Vellur profile image
      Author

      Nithya Venkat 15 months ago from Dubai

      Surabhi Kaura thank you for your visit and yes we have to preserve nature and its glorious beauty.

    • annart profile image

      Ann Carr 12 months ago from SW England

      Lots of information here about something we all take for granted. There is a spot in the Isle of Wight, off the south coast of England, which has many different colours of sand with which I was fascinated as a child.

      I love being near the sea and beaches; sand is a part of my childhood!

      Ann

    • Vellur profile image
      Author

      Nithya Venkat 12 months ago from Dubai

      annart it must have been great to grow up in a place with sea and beaches. I love the seaside too, thank you for your visit.

    • annart profile image

      Ann Carr 12 months ago from SW England

      It was great. The best bit is that I'm about to move to a town not far away but much closer to the sea! Can't wait.

      Ann

    • AudreyHowitt profile image

      Audrey Howitt 11 months ago from California

      So many colors! I didn't know!

    • Vellur profile image
      Author

      Nithya Venkat 11 months ago from Dubai

      AudreyHowitt, yes all beautiful colors! Thank you for your visit.

    • teaches12345 profile image

      Dianna Mendez 11 months ago

      I enjoyed this article. I would love to see the green sand beach, it is so pretty. We have the course sand on beaches around here with a few gypsum in between. So interesting to read these types of posts.

    • Vellur profile image
      Author

      Nithya Venkat 11 months ago from Dubai

      teaches12345 thank you and am glad you enjoyed this article.

    • Sunshine625 profile image

      Linda Bilyeu 9 months ago from Orlando, FL

      I had no idea there were so many different colors of sand. I have a friend in Tasmania who visits White Beach often, but never mentioned the sand was white! I am going to ask my friends in New Mexico to take me to the White Sands National Monument the next time I am visiting, unless it's too far out of the way. I would like to visit Dubai too, one day.

    • Vellur profile image
      Author

      Nithya Venkat 9 months ago from Dubai

      It would be a fantastic experience to visit the White Sands Beach. You should visit Dubai someday soon!

    • AudreyHowitt profile image

      Audrey Howitt 9 months ago from California

      Still an excellent article!

    • Vellur profile image
      Author

      Nithya Venkat 9 months ago from Dubai

      AudreyHowitt thank you for your visit.

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