Abstract
IN this memoir the author gives an account of the microscopic characters exhibited by the basalts of the volcanic district of the Campos de Calatrava, which basalts he shows to have been erupted in Tertiary times. These rocks appear to belong to Dr. Boricky's classes of the Nepheline-basalts and the Nephelinitoid-basalts, in the former of which the nepheline is fully crystallised, while in the latter it exists as a glassy base in which crystals are beginning to make their appearance. The primary minerals of these rocks are nepheline, augite, magnetite, and olivine, which may be regarded as their essential constituents, and apatite and hornblende, which the author regards as accessory or accidental constituents. The secondary or derivative minerals are kaholite, hinsuite, and hematite, magnetite, serpentine, and aragonite. The memoir is illustrated by a coloured plate of rock-sections.
Estudio Micrográfico ne Algunos Basaltos de Cuidad-Real.
Par Don Francisco Quiroga. (Madrid, 1880.)
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Estudio Micrográfico ne Algunos Basaltos de Cuidad-Real . Nature 22, 582 (1880). https://doi.org/10.1038/022582b0
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DOI: https://doi.org/10.1038/022582b0