Ailsa Craig microgranite glacial erratic
Description: Four specimens of Reibeckite microgranite brought from Ailsa Craig for comparison purposes. Three with dark blue, medium grained, mottled riebeckite phenocrysts with a light yellowish grey fine-grained matrix. One is brownish grey; fine-grained groundmass with fine-grained euhedral feldspars and medium-grained black (riebeckite?) phenocrysts intergrown with fine-grained feldspars.
Taxonomic name: glacial erratic: Ailsa Craig riebeckite microgranite
Collection: Natural History Geology Collection
ID number: 1955-0127
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