Stone

Hard material which has been produced by the crushing of rock by machinery. It is commonly termed crushed stone and is used in landscaping work and the construction of sports pitches, being of an angular size to aid stability the structure.

Stones between 4mm and 64mm diameter (using the Udden-Wentworth scale for grain size) are often termed pebbles and these are commonly found within natural soil profiles for sports pitches or landscaping work. The terms gravel and stone are often used interchangeably.

For sports turf construction the use of the term stone is sometimes used to distinguish hard material which has a diameter greater than 8mm, in contrast to gravel which is 2-8mm in diameter. (Stewart, V.I. (1994) ‘Sports Turf Science, construction and maintenance', E&FN Spon, p.11)