Petrology for Students An Introduction to the Study of Rocks Under the Microsco
Petrology for Students An Introduction to the Study of Rocks Under the Microsco
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(1900) Ivi, 211-214.
170 LEUCITOPHYRES British East Africa 1 . Here the felspar is anorthoclase in large porphyritic crystals, and the other phenocrysts are a pale green augite and abundant olivine.
The leucitophyres are a very small group of rocks, known only from a few districts, and best developed in the late Tertiary lavas of the Eifel. The leucite is often of two genera- tions, the larger crystals being frequently of irregular shape. It is always accompanied by nosean and sanidine (fig. 57..., B). The ferro-magnesian mineral is a green pleochroic augite with zonary banding : the other constituents are sphene, occasionally biotite, and often a little melanite. The structure of the rocks is very variable. In some there is a well-defined ground-mass of minute nepheline, sanidine, augite, and leucite, enclosing phenocrysts of leucite and nosean (Olbriick, etc. ). In other varieties there is but little sanidine (Schorenberg), while others again have sanidine in large shapeless plates enclosing the other constituents instead of a ground-mass (Perlerkopf).
What to read after Petrology for Students An Introduction to the Study of Rocks Under the Microsco?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Harker to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(1900) Ivi, 211-214.
170 LEUCITOPHYRES British East Africa 1 . Here the felspar is anorthoclase in large porphyritic crystals, and the other phenocrysts are a pale green augite and abundant olivine.
The leucitophyres are a very small group of rocks, known only from a few districts, and best developed in the late Tertiary lavas of the Eifel. The leucite is often of two genera- tions, the larger crystals being frequently of irregular shape. It is always accompanied by nosean and sanidine (fig. 57..., B). The ferro-magnesian mineral is a green pleochroic augite with zonary banding : the other constituents are sphene, occasionally biotite, and often a little melanite. The structure of the rocks is very variable. In some there is a well-defined ground-mass of minute nepheline, sanidine, augite, and leucite, enclosing phenocrysts of leucite and nosean (Olbriick, etc. ). In other varieties there is but little sanidine (Schorenberg), while others again have sanidine in large shapeless plates enclosing the other constituents instead of a ground-mass (Perlerkopf).
What to read after Petrology for Students An Introduction to the Study of Rocks Under the Microsco?
You can find similar books in the "Read Also" column, or choose other free books by Alfred Harker to read onlineMoreLess
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