Granites with the necessary properties are uncovered in only a couple of locations on EarthArticle by: Hobart M. King, PhD, RPG
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A gold Medal in Curling place Granite in the Spotlight

The United states won the first-ever Olympic gold Medal in the sports of curling in ~ the 2018 Winter Olympics. This lugged attention come the use of granite in manufacturing the curling stones, also known as "rocks," provided to pat this sport. Curling stones weigh between 38 and also 44 pounds and also are do from granites v special physical properties.

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The "Running Surface"

The bottom that a curling stone, well-known as the "running surface," need to be do of a granite that will absorb very little water. Any water soaked up into the to run surface can freeze, expand, fracture mineral grains, and produce pits on the bottom of the stone. This pits will create roughness on the running surface ar of the rock and weaken its performance.


The "Striking Surface"

The human body of a curling stone is ideal made from really tough granite that is able come absorb impacts with minimal damage to that is mineral grains. Damaged mineral grains can create a pit on the striking surface ar of the rock and change the way that affect energy is absorbed by the stone. This will damage the power of the stone during play. Also, once a pit ~ above the striking surface ar of the rock develops, the spot becomes fragile to extr breakage. It should be repaired before the damages spreads.

Two Curling rock Granite Localities

Granites through the unique properties needed to make curling stones have only been found in a couple of locations. This day the most renowned curling stones are made indigenous granites quarried in just two locations: 1) Ailsa Craig, an island in the Firth of Clyde, the channel between Ireland and Scotland; and, 2) the Trefor Granite Quarry, situated on the shore of Wales.

Curling stone Manufacturers

Kays the Scotland, located in Mauchline, Ayrshire, has actually been do curling stones from the Ailsa Craig granites since 1851. Castle have created curling stones because that the Winter Olympics since 1924 and have to be exclusive carriers for the Olympics due to the fact that 2006. Kays supplies the Ailsa Craig Blue Hone granite because that the running surface ar of the stone. They usage the Ailsa Craig typical Green granite for the human body of the stone. Kays quarries this granites native Ailsa Craig follow to a provide of exclusive legal rights from the Marquess that Ailsa.

Canada Curling rock Company has been creating stones indigenous Trefor Granite because 1992 and supplied stones because that the 2002 Winter Olympics. Canada Curling rock Company has actually an exclusive agreement with Trefor Granite for material used to make curling stones.


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