Granites v the essential properties are found in only a couple of locations on EarthArticle by: Hobart M. King, PhD, RPG
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A yellow Medal in Curling place Granite in the Spotlight

The United claims won its first-ever Olympic yellow Medal in the sports of curling at the 2018 Winter Olympics. This carried attention to the use of granite in production the curling stones, also known together "rocks," used to pat this sport. Curling stones weigh in between 38 and also 44 pounds and also are made from granites with special physics properties.

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The "Running Surface"

The bottom that a curling stone, known as the "running surface," should be made of a granite that will certainly absorb very little water. Any type of water took in into the running surface could freeze, expand, fracture mineral grains, and produce pits on the bottom the the stone. This pits will develop roughness top top the running surface of the rock and compromise its performance.


The "Striking Surface"

The human body of a curling rock is best made from really tough granite that is able come absorb effects with minimal damage to the mineral grains. Damaged mineral grains can develop a pit ~ above the striking surface of the stone and adjust the means that affect energy is took in by the stone. This will damage the performance of the rock during play. Also, when a pit ~ above the striking surface of the rock develops, the spot becomes fragile to extr breakage. It need to be repaired before the damages spreads.

Two Curling stone Granite Localities

Granites with the distinct properties required to do curling stones have actually only been found in a couple of locations. This day the most popular curling stones room made native granites quarried in simply two locations: 1) Ailsa Craig, one island in the Firth that Clyde, the channel between Ireland and Scotland; and, 2) the Trefor Granite Quarry, situated on the coast of Wales.

Curling rock Manufacturers

Kays the Scotland, located in Mauchline, Ayrshire, has been do curling stones native the Ailsa Craig granites due to the fact that 1851. Castle have produced curling stones for the Winter Olympics due to the fact that 1924 and also have been exclusive service providers for the Olympics due to the fact that 2006. Kays provides the Ailsa Craig Blue Hone granite because that the running surface of the stone. They use the Ailsa Craig usual Green granite for the human body of the stone. Kays quarries these granites from Ailsa Craig according to a give of exclusive rights from the Marquess the Ailsa.

Canada Curling rock Company has actually been creating stones from Trefor Granite due to the fact that 1992 and supplied stones for the 2002 Winter Olympics. Canada Curling stone Company has actually an exclusive covenant with Trefor Granite for product used to make curling stones.


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