Sharp sand

Further information: Grus (geology)

Sharp sand, also known as grit sand or river sand and as builders' sand, concrete sand, or ASTM C33 when medium or coarse grain, is a gritty sand used in concrete and potting soil mixes or to loosen clay soil[1] as well as for building projects. It is not cleaned or smoothed to the extent recreational play sand is. It is useful for drainage.[2] It is an angular grained sand.[3] It was used in the production of brass.[4] It is now used in the building trade. Sand and gravel ridges known as eskers are a frequently used source.[5]

References

1. "Definition of sharp sand". davesgarden.com.
2. livingearth.net Sharp Sand | Living Earth Texas
3. "Definition of SHARP SAND". www.merriam-webster.com.
4. "London Encyclopaedia; Or, Universal Dictionary of Science, Art, Literature and Practical Mechanics: Comprising a Popular View of the Present State of Knowledge". Thomas Tegg. November 16, 1829 – via Google Books.
5. Lyle, Paul (October 27, 2010). Between rocks and hard places: discovering Ireland's northern landscapes. Macmillan. ISBN 9780337095870 – via Google Books.