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Bright Angel Shale
A silty-shale where the clasts are dominated by quartz. Sample collected from an area typified by interbedded limestones and shale.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Muav Limestone
Limestone containing fossils of the alga, Girvanella.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Bright Angel Shale
Red siltstone lithology of the Bright Angel Shale.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Bright Angel Shale
Green clay lithology of the Bright Angel Shale.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Muav Limestone
Mottled lithology of the Muav Limestone.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Tapeats Sandstone
Sandstone shows metamorphic overprinting with triple junctions between quartz grains common.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Pegmatite
This sample is mis-labeled as a pegmatite. It is really a porphyritic dike material that cuts through the Zoroaster Granite. The phenocrysts are hornblende.
Brahma Schist
Part of the The Granite Gorge Metamorphic Suite, this is usually considered a metavolcanic, and its mineralogy is dominated by quartz and mica.
Both thin section images were taken at a 400x magnification.
Both thin section images were taken at a 400x magnification.
Vishnu Schist
Both cross polarized and plain polarized images were taken at a 400x magnification.
Vishnu Schist
Both thin section images were taken at a 400x magnification.
Adirondack Highlands, New York Western Minerals Supplementary Materials
OCR PDF of supplemental information for the Anorthosite-Charnockite Metamorphic Suite-Adirondack Mountains, New York collection.
Northern Apennines Ophiolites Western Minerals Supplementary Materials
OCR PDF of supplemental information for the Northern Apennines Ophiolites collection.
Powderhorn Carbonatite Western Minerals Supplementary Materials
OCR PDF of supplemental information for the Powderhorn Carbonatite collection.
Grand Canyon Western Minerals Supplementary Information
OCR PDF of supplemental information for the Grand Canyon collection.