UK Grid Reference: NM462846
Latitude: 56°52'59"N
Longitude: 6°10'0"W
A pitchstone inselberg, the highest point on Eigg, which was formed after a volcanic eruption 58 million years ago filled-in a river valley carved through basalt rocks. The softer basalt has since been eroded leaving the harder pitchstone behind. The pitchstone contains a high percentage of phenocrysts of sanidine feldspar. Other minerals are found in minor veins and vugs presumably from later alteration.
Mineral List
4 entries listed. 1 valid mineral.
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