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Sand is made up of fine particles of rock and minerals. The most common type is largely composed of silica (silicon dioxide), usually in the form of quartz. Sand found in tropical locations are usually composed of limestone.
Sand composition can vary and may include feldspar, magnetite, glauconite, gypsum and coral.

en.wikipedia.org/wiki/Sand

Close-up (1×1 cm) of sand from the Gobi Desert, Mongolia. Sand is a naturally occurring granular material composed of finely divided rock and mineral .... In 2012 French director Denis Delestrac made a documentary called "Sand Wars" about ...

www.livescience.com/34748-what-is-sand-beach-sand.html

May 28, 2013 ... The most common component of sand is silicon dioxide in the form of quartz. The Earth's landmasses are made up of rocks and minerals, ...

www.livescience.com/38163-where-beach-sand-comes-from.html

Jul 16, 2013 ... Here's a look at the geological history of beach sand and why some beaches ... have collected, tossed up by the waves and as sediment from inland areas. ... amount of the sand particles there are made of calcium carbonate, ...

paradise.docastaway.com/white-sand-beaches-parrot-fish-poop-feaces

Nov 8, 2011 ... Now that you know that the sand you are walking on is made up of minute excrements of this fish, here's the explanation why you shouldn't feel ...

www.nature.com/scitable/blog/saltwater-science/what_is_sand_made_of

Oct 22, 2013 ... Have you ever wondered where sand comes from, or what it's made of? ... Basalt makes up the ocean crust, and hot-spot islands like Hawaii, ...

www.huffingtonpost.com/2014/03/29/hawaii-beaches-parrotfish-poop_n_5052935.html

Mar 29, 2014 ... There are seven quintillion, five hundred quadrillion grains of sand in the world, according to.

www.newsweek.com/many-white-sand-beaches-are-basically-fish-poop-369494

Sep 7, 2015 ... People walk on a white-sand beach in the province of Matanzas around 135 ... Many white sand beaches are actually made up of fish poop.

www.to-hawaii.com/hawaiibeachsand.php

Beaches in Hawaii can be composed of white, yellow, black, red or even green sand, as well as pebbles and rocks. Most beaches in the world are made up of ...

www.sandatlas.org/what-is-sand-made-of

Sand is made of minerals, rock fragments and biogenic grains. Find out more about each.