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Armourstone is a generic term for broken stone with stone masses between 100 and 10,000 kilograms (220 and 22,050 lb) (very coarse aggregate) that is suitable for use in hydraulic engineering. Dimensions and characteristics for armourstone are laid down in European Standard EN13383. [ 1 ]
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The stone or stone weight (abbreviation: st.) [1] is an English and British imperial unit of mass equal to 14 avoirdupois pounds (6.35 kg). [ nb 1 ] The stone continues in customary use in the United Kingdom and Ireland for body weight .
Among other known ancient Irish stones are the Aughrim Graveyard Stone which weighs 115 kg (254 lb) and meant to be shouldered, the Faha Stones which are a pair weighing 162 kg (357 lb) and 112 kg (247 lb), and the 215 kg (474 lb) Flag of Denn, which is a heavy, almost perfectly rectangular stone associated with strong men of the parish who ...
Zircon (ZrSiO 4) is useful in geochronology as U 6+ can substitute for Zr 4+; furthermore, because of its very resistant structure, it is difficult to reset it as a chronometer. Staurolite is a common metamorphic intermediate-grade index mineral. It has a particularly complicated crystal structure that was only fully described in 1986.
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The curling stone (also sometimes called a rock in North America) is made of granite and is specified by the World Curling Federation, which requires a weight between 19.96 and 17.24 kilograms (44 and 38 lb), a maximum circumference of 914 millimetres (36 in), and a minimum height of 114 millimetres (4 + 1 ⁄ 2 in). [31]
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and Δν Cs. —