The feldspars are yellowish-white, white, and earthy upon weathering, and mainly include plagioclase feldspar (35% abundance; 0.5–1.5 mm), mostly sericitized potassium feldspar (20%; 0.7–2.0 mm), and ...

Photo by Dr. Juliet Ugbede Akoh: An example of a Rock (aggregates of minerals), made up of Quartz, Amphibole, Pink Potassium Feldspar, and White Plagioclase Feldspar Focus on chemistry, physics, ...

Gunn and Watkins (1970) proposed that these lavas are part of the same volcanic episode, and that their feldspar phenocrysts might even have originated in the same magma chamber. In a future visit, we ...

105 Phyllic alteration Phyllic alteration is typical for the assemblage quartz sericite pyrite The phyllic alteration is characterized by the complete substitution of the plagioclase feldspars by ...

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Last fall while waiting for freeze-up to provide easier travel, I perused two library books on the geology of Alaska, with my ...