4 Replies to “Contest #540 Hint”

  1. Ailsa Craig is the traditional source of curling stones and produces two types of granite, Blue Hone and Ailsa Craig Common Green

  2. Ailsa Craig 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 (Wikipedia).

    55°15’5.67″N 5° 6’35.06″W

    Good one. The granite was a given but it looks so much like an abandoned army base.

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