Abstract
I. §1. AS a preliminary to the study of the schistose or stratiform crystalline rocks, it is desirable to consider the wider question of the origin of crystalline rocks in general, which are often named Primary or Primitive Rocks to distinguish them from those derived there from by mechanical or chemical disintegration. The designation of “crystalline rocks” is defective, inasmuch as we find, associated with masses having a right to this title, and geologically confounded with them, other rocks, such as serpentine, obsidian, perlite, and others, which are not crystalline in character, but colloidal, or, to use the designation of Breithaupt, porodic. The primary rocks, then, including both crystalline and porodic masses, may be divided geologically into three categories:—
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HUNT, T. On Crystaline Schists 1 . Nature 38, 519–522 (1888). https://doi.org/10.1038/038519a0
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DOI: https://doi.org/10.1038/038519a0