Sand is a granular
material composed of finely divided rock
particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel
and coarser than silt
. Sand can also refer to a textural class
of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass.
The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal
settings is silica
(silicon dioxide, or SiO2
), usually in the form of quartz
. The second most common type of sand is calcium carbonate
, for example, aragonite
, which has mostly been created, over the past half billion years, by various forms of life, like coral
. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean
. Somewhat more rarely, sand may be composed of calcium sulfate
, such as gypsum
, as is found in places like White Sands National Park
and Salt Plains National Wildlife Refuge
in the U.S.
Sand is a non-renewable resource
over human timescales, and sand suitable for making concrete
is in high demand. Desert sand, although plentiful, is not suitable for concrete. 50 billion tons of beach sand and fossil sand is used each year for construction.
The exact definition of sand varies. The scientific Unified Soil Classification System
used in engineering and geology corresponds to US Standard Sieves, and defines sand as particles with a diameter of between 0.074 and 4.75 millimeters. By another definition, in terms of particle size
as used by geologist
s, sand particles range in diameter from 0.0625 mm (or mm) a volume of approximately 0.00012 cubic millimetres, to 2 mm, a volume of approximately 4.2 cubic millimetres, the difference in volumes being 34,688 measures difference. Any particle falling within this range of sizes is termed a ''sand grain''. Sand grains are between gravel
(with particles ranging from 2 mm up to 64 mm by the latter system, and from 4.75 mm up to 75 mm in the former) and silt
(particles smaller than 0.0625 mm down to 0.004 mm). The size specification between sand and gravel has remained constant for more than a century, but particle diameters as small as 0.02 mm were considered sand under the Albert Atterberg
standard in use during the early 20th century. The grains of sand in Archimedes
' ''The Sand Reckoner
'' written around 240 BCE, were 0.02 mm in diameter. A 1938 specification of the United States Department of Agriculture
was 0.05 mm. A 1953 engineering standard published by the American Association of State Highway and Transportation Officials
set the minimum sand size at 0.074 mm. Sand feels gritty when rubbed between the fingers. Silt
, by comparison, feels like flour
14688 grades sands as fine, medium, and coarse with ranges 0.063 mm to 0.2 mm to 0.63 mm to 2.0 mm. In the United States, sand is commonly divided into five sub-categories based on size: very fine sand ( – mm diameter), fine sand ( mm – mm), medium sand ( mm – mm), coarse sand ( mm – 1 mm), and very coarse sand (1 mm – 2 mm). These sizes are based on the Krumbein phi scale
, where size in Φ = -log2
D; D being the particle size in mm. On this scale, for sand the value of Φ varies from −1 to +4, with the divisions between sub-categories at whole numbers.
The most common constituent of sand, in inland continental settings and non-tropical coastal settings, is silica
(silicon dioxide, or SiO2
), usually in the form of quartz
, which, because of its chemical inertness and considerable hardness, is the most common mineral
resistant to weathering
The composition of mineral sand is highly variable, depending on the local rock sources and conditions. The bright white sands
found in tropical and subtropical coastal settings are eroded limestone
and may contain coral
fragments in addition to other organic
or organically derived fragmental material, suggesting that sand formation depends on living organisms, too. The gypsum
sand dunes of the White Sands National Park
in New Mexico
are famous for their bright, white color. Arkose
is a sand or sandstone
with considerable feldspar
content, derived from weathering
of a (usually nearby) granitic
rock outcrop. Some sands contain magnetite
, or gypsum
. Sands rich in magnetite
are dark to black in color, as are sands derived from volcanic basalt
s and obsidian
bearing sands are typically green in color, as are sands derived from basaltic lava
with a high olivine
content. Many sands, especially those found extensively in Southern Europe
, have iron
impurities within the quartz crystal
s of the sand, giving a deep yellow color. Sand deposits in some areas contain garnet
s and other resistant minerals, including some small gemstone
over a long period of time, mainly by water and wind, and their sediment
s are transported downstream. These sediments continue to break apart into smaller pieces until they become fine grains of sand. The type of rock the sediment originated from and the intensity of the environment give different compositions of sand. The most common rock to form sand is granite
, where the feldspar
minerals dissolve faster than the quartz
, causing the rock to break apart into small pieces. In high energy environments rocks break apart much faster than in more calm settings. In granite rocks this results in more feldspar minerals in the sand because they don't have as much time to dissolve away. The term for sand formed by weathering is "epiclastic."
Sand from rivers are collected either from the river itself or its flood plain
and accounts for the majority of the sand used in the construction industry. Because of this, many small rivers have been depleted, causing environmental concern and economic losses to adjacent land. The rate of sand mining in such areas greatly outweighs the rate the sand can replenish, making it a non-renewable resource.
Sand dunes are a consequence of dry conditions or wind deposition. The Sahara Desert
is very dry because of its geographic location and proximity to the equator
. It is known for its vast sand dunes, which exist mainly due to a lack of vegetation and water. Over time, wind blows away fine particles, such as clay and dead organic matter, leaving only sand and larger rocks. Only 15% of the Sahara is sand dunes, while 70% is bare rock. The wind is responsible for creating these different environments and shaping the sand to be round and smooth. These properties make desert sand unusable for construction.
Beach sand is also formed by erosion. Over thousands of years, rocks are eroded near the shoreline from the constant motion of waves and the sediments build up. Weathering and river deposition also accelerate the process of creating a beach, along with marine animals interacting with rocks, such as eating the algae off of them. Once there is a sufficient amount of sand, the beach acts as a barrier to keep the land from eroding any further. This sand is ideal for construction as it is angular and of various sizes.
Marine sand (or ocean sand) comes from sediments transported into the ocean and the erosion of ocean rocks. The thickness of the sand layer varies, however it is common to have more sand closer to land; this type of sand is ideal for construction and is a very valuable commodity. Europe is the main miners of marine sand, which greatly hurts ecosystems and local fisheries.
The study of individual grains can reveal much historical information as to the origin and kind of transport of the grain. Quartz sand
that is recently weathered from granite
quartz crystals will be angular. It is called grus
in geology or sharp sand
in the building trade where it is preferred for concrete, and in gardening where it is used as a soil amendment to loosen clay soils. Sand that is transported long distances by water or wind will be rounded, with characteristic abrasion patterns on the grain surface. Desert sand is typically rounded.
People who collect sand as a hobby are known as arenophile
s. Organisms that thrive in sandy environments are psammophiles.
: Before sandpaper, wet sand was used as an abrasive element between rotating devices with elastic surface and hard materials such as very hard stone (making of stone vases), or metal (removal of old stain before re-staining copper cooking pots).
: Sandy soil
s are ideal for crops such as watermelons, peaches, and peanuts, and their excellent drainage characteristics make them suitable for intensive dairy farming.
* Air filtration
: Finer sand particles mixed with cloth was commonly used in certain gas mask
filter designs but have largely been replaced by microfiber
: Sand makes a low-cost aquarium base material which some believe is better than gravel for home use. It is also a necessity for saltwater reef tank
s, which emulate environments composed largely of aragonite
sand broken down from coral
* Artificial reefs
bagged sand can serve as the foundation for new reefs.
* Artificial island
s in the Persian Gulf
* Beach nourishment
: Governments move sand to beach
es where tides, storms, or deliberate changes to the shoreline erode the original sand.
: Manufacturing plants add sand to a mixture of clay
and other materials for manufacturing bricks.
: Coarse sand makes up as much as 75% of cob.
: Sand is often a principal component of this critical construction material.
: Sand rich in silica is the principal component in common glasses.
* Hydraulic fracturing
: A drilling technique for natural gas, which uses rounded silica sand as a "proppant", a material to hold open cracks that are caused by the hydraulic fracturing process.
* Landscaping: Sand makes small hills and slopes (golf courses would be an example).
: Sand is mixed with masonry cement or Portland cement
and lime to be used in masonry construction.
: Mixing sand with paint produces a textured finish
for walls and ceilings or non-slip floor surfaces.
* Railroads: Engine drivers and rail transit operators
use sand to improve the traction of wheels on the rails.
* Recreation: Playing with sand is a favorite beach activity. One of the most beloved uses of sand is to make sometimes intricate, sometimes simple structures known as sand castle
s, proverbially impermanent. Special play areas for children, enclosing a significant area of sand and known as sandboxes, are common on many public playgrounds, and even at some single-family homes. Sand dunes are also popular among climbers, motorcyclists and beach buggy
* Roads: Sand improves traction (and thus traffic safety) in icy or snowy conditions.
* Sand animation
: Performance art
ists draw images in sand. Makers of animated films use the same term to describe their use of sand on frontlit or backlit glass.
* Sand casting
: Casters moisten or oil molding sand
, also known as foundry
sand and then shape it into molds into which they pour molten material. This type of sand must be able to withstand high temperatures and pressure, allow gases to escape, have a uniform, small grain size, and be non-reactive with metals.
s: These protect against floods and gunfire. The inexpensive bags are easy to transport when empty, and unskilled volunteers can quickly fill them with local sand in emergencies.
: Graded sand serves as an abrasive
in cleaning, preparing, and polishing.
: Quartz sand is a raw material for the production of silicon
* Thermal weapon
: While not in widespread use anymore, sand used to be heated and poured on invading troops in the classical and medieval time periods.
* Water filtration
: Media filter
s use sand for filtering water. It is also commonly used by many water treatment facilities, often in the form of rapid sand filter
: an Islam
ic ritual wiping of parts of the body.
"skeletons": Animals in this order of marine benthic cnidaria
ns related to coral
s and sea anemone
s, incorporate sand into their mesoglea
for structural strength, which they need because they lack a true skeleton.
Resources and environmental concerns
Only some sands are suitable for the construction industry, for example for making concrete
. Because of the growth of population and of cities and the consequent construction activity there is a huge demand for these special kinds of sand, and natural sources are running low. In 2012 French director Denis Delestrac
made a documentary called "Sand Wars
" about the impact of the lack of construction sand. It shows the ecological and economic effects of both legal and illegal trade in construction sand.
To retrieve the sand, the method of hydraulic dredging is used. This works by pumping the top few meters of sand out of the water and filling it into a boat, which is then transported back to land for processing. Unfortunately, all marine life
mixed in with the extracted sand is killed and the ecosystem can continue to suffer for years after the mining is complete. Not only does this affect marine life, but also the local fishing industries because of the loss of life, and communities living close to the water's edge. When sand is taken out of the water it increases the risk of landslides, which can lead to loss of agricultural land and/or damage to dwellings.
Sand's many uses require a significant dredging
industry, raising environmental concerns over fish depletion, landslides, and flooding. Countries such as China, Indonesia, Malaysia, and Cambodia ban sand exports, citing these issues as a major factor. It is estimated that the annual consumption of sand and gravel is 40 billion tons and sand is a US$70 billion global industry.
The global demand for sand in 2017 was 9.55 billion tons as part of a $99.5 billion industry.
While sand is generally non-toxic, sand-using activities such as sandblasting
require precautions. Bags of silica sand used for sandblasting now carry labels warning the user to wear respiratory protection to avoid breathing the resulting fine silica dust
. Safety data sheet
s for silica sand state that "excessive inhalation of crystalline silica is a serious health concern".
In areas of high pore water pressure
, sand and salt water can form quicksand
, which is a colloid hydrogel
that behaves like a liquid. Quicksand produces a considerable barrier to escape for creatures caught within, who often die from exposure (not from submersion) as a result.
Manufactured sand (M sand) is sand made from rock by artificial processes, usually for construction purposes in cement or concrete. It differs from river sand by being more angular, and has somewhat different properties.
, United Arab Emirates, the use of sand has been very demanding in the construction of infrastructure and creating new islands. They used up their own reserves and also imported sand from Australia. There have been three projects to create artificial islands needing more than 835 million tonnes of sand, which cost more than US$26 billion.
''Beach Sand: What It Is, Where It Comes From and How It Gets Here''
- Beaufort County Library
;Sand mining side-effects
The World Is Running Out Of Sand
- ''New York Times''
- ''New York Times''
How Demand For Sand Is Killing Rivers In Africa
Dubai Imports Sand
Category:Soil-based building materials