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ISO 14688 grades gravels as fine, medium, and coarse, with ranges 2–6.3 mm (0.079–0.248 in) for fine and 20–63 mm (0.79–2.48 in) for coarse. One cubic metre of gravel typically weighs about 1,800 kg (4,000 lb), or one cubic yard weighs about 3,000 lb (1,400 kg). Gravel is an important commercial product, with a number of applications.
Glaciers carry a lot of coarse-grained material and many glacial deposits are conglomeratic. tillites, the sediments deposited directly by a glacier, are typically poorly sorted, matrix-supported conglomerates. The matrix is generally fine-grained, consisting of finely milled rock fragments.
Porphyry (/ ˈ p ɔːr f ə r i / POR-fə-ree) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass.
The term is based on the word "whet", which means to sharpen a blade, [3] [4] not on the word "wet". The verb nowadays to describe the process of using a sharpening stone for a knife is simply to sharpen, but the older term to whet is still sometimes used, though so rare in this sense that it is no longer mentioned in, for example, the Oxford Living Dictionaries.
Fieldstone is a naturally occurring type of stone, which lies at or near the surface of the Earth. Fieldstone is a nuisance for farmers seeking to expand their land under cultivation, but at some point it began to be used as a construction material. [1] [2] [3] Strictly speaking, it is stone collected from the surface of fields where it occurs ...
Kama (tool), a Japanese hand scythe used in farming, and martial arts; Khopesh, an Egyptian long sickle or scythe as a weapon; Scythe sword, scythe blade converted to use as a weapon; Sickle, the archetypal forerunner of the scythe; String trimmer, a garden tool for cutting grass and groundcover which uses a flexible monofilament line instead ...
Gritstone or grit is a hard, coarse-grained, siliceous sandstone. This term is especially applied to such sandstones that are quarried for building material . British gritstone was used for millstones to mill flour, to grind wood into pulp for paper and for grindstones to sharpen blades.
In such stone avalanches, well-rounded cobbles may travel the farthest on account of their low rolling friction. [9] When the product of alluvial processes, the cobble conglomerate's matrix consists of gravel and coarse sand. In contrast, the matrices of flow-deposited conglomerates are primarily mud. [8]