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Countryside Council for Wales (CCW) home page | Sponsored by Welsh Assembly Government

Countryside Council for Wales
Landscape & wildlife

Basic

Describes quartz-free Igneous rocks that are relitively rich in iron, magnesium and calcium, the silica (SiO2) content being relitively low (nominally 45-53% by weight); includes such rocks as gabbro and basalt.

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The geoconservation team
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CCW
Maes-y-Ffynnon
Penrhosgarnedd
Bangor
Gwynedd
LL57 2DW
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0845 1306229
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