The Roman Comagmatic Region
The Roman Comagmatic Region
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Mode indeterminate.
Type specimens from Monte Ciliano, Soriano Volcano, Ciminian District. Type speci- men of breccia form from La Cava, near Viterbo, Ciminian District.
III. 5. 2. 2. Arsal Vulsinose-Ciminose [Vulsinite, Arso Type].
Megascopic characters. These rocks are light gray when fresh, but weather to reddish tones, especially in the groundmass. They are decidedly porphyritic, the phenocrysts being quite large and making up rather over one-eighth of the rock mass. The great majority of t...hese, as well as the largest, are of feldspar, which are mostly tabular parallel to b (oio) and from 5 to 10 mm. Long. There are also few small, black, prismatic phenocrysts of augite, and still more rare small tables of biotite. The light-gray groundmass is clearly phanerocrystalline and fine-grained.
Microscopic characters. In thin section the phenocrysts of alkali feldspar are seen to be more common than those of the lime-soda feldspar. The former do not show usually the common characteristics of soda-orthoclase ; though the analysis of the rock indicates that they are quite sodic, while the latter give extinction angle corresponding to an average composition of Ab r An 2 .
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You can find similar books in the "Read Also" column, or choose other free books by Henry S Henry Stephens Washington to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Mode indeterminate.
Type specimens from Monte Ciliano, Soriano Volcano, Ciminian District. Type speci- men of breccia form from La Cava, near Viterbo, Ciminian District.
III. 5. 2. 2. Arsal Vulsinose-Ciminose [Vulsinite, Arso Type].
Megascopic characters. These rocks are light gray when fresh, but weather to reddish tones, especially in the groundmass. They are decidedly porphyritic, the phenocrysts being quite large and making up rather over one-eighth of the rock mass. The great majority of t...hese, as well as the largest, are of feldspar, which are mostly tabular parallel to b (oio) and from 5 to 10 mm. Long. There are also few small, black, prismatic phenocrysts of augite, and still more rare small tables of biotite. The light-gray groundmass is clearly phanerocrystalline and fine-grained.
Microscopic characters. In thin section the phenocrysts of alkali feldspar are seen to be more common than those of the lime-soda feldspar. The former do not show usually the common characteristics of soda-orthoclase ; though the analysis of the rock indicates that they are quite sodic, while the latter give extinction angle corresponding to an average composition of Ab r An 2 .
What to read after The Roman Comagmatic Region?
You can find similar books in the "Read Also" column, or choose other free books by Henry S Henry Stephens Washington to read onlineMoreLess
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