A red, earthy, monoclinic mineral. It was discovered in the 1970s by Dr Jeff Wilson and named after the Macaulay Institute (now know as the James Hutton Institute) Aberdeen. This is the only known source of Macaulayite in the world and is formed from granite which has been weathered by tropical climates prior to the last Ice Age.

The substance is currently being studied by NASA (National Aeronautics and Space Administration) as it is believed that this gives the planet Mars its colour possibly proving that life on Mars can be sustained.

Macaulayite is close to Rowan Tree Car Park.

Map Reference: GR 693 244

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