<Tr> <Th> Population </Th> <Td> 0 </Td> </Tr> <Tr> <Th> References </Th> <Td> </Td> </Tr> <P> Ailsa Craig (/ ˈeɪlsə /; Scottish Gaelic: Creag Ealasaid) is an island of 99 hectares (240 acres) in the outer Firth of Clyde, 16 kilometres (10 miles) west of mainland Scotland, upon which blue hone granite has long been quarried to make curling stones . The now uninhabited island is formed from the volcanic plug of an extinct volcano . </P> <P> The island, colloquially known as "Paddy's milestone", was a haven for Catholics during the Scottish Reformation in the 16th century, but is today a bird sanctuary, providing a home for huge numbers of gannets and an increasing number of puffins . </P>

Where do curling stones come from in scotland