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Glacial erratic dolerite

Description: Dark greenish grey; fine-grained: quartz, feldspar and a black mineral. Specimen is probably a weathered basic igneous rock but it also bears a resemblance to a greywacke sandstone with a volcanic provenance. Possibly a glacial erratic.

Taxonomic name: glacial erratic: dolerite

Collection: Natural History Geology Collection

ID number: 1975-0166


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