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Encyclopedia Britannica - Main :: PER-PIG |
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PHONOLITE (Gr. ~vi7, sound, and Moos, stone) , in petrology, a group of volcanic lavas containing much nepheline and sanidine felspar. The term "clinkstone " was formerly given by geologists to many fine grained compact lavas, which split into thin tough plates, and gave out a ringing sound when struck with the hammer
great
The dominant minerals are sanidine, nepheline, pyroxene, amphibole, various felspathoids and iron oxides.. The sanidine is usually in two generations, the first consisting of large crystals of flattened and tabular shape, while the second generation is represented by small rectangular prisms arranged in parallel streams in the ground-mass; these felspars are nearly always simply twinned on the Carlsbad plan. They contain often as much soda as potash. The nepheline takes the form of hexagonal prisms with flat ends, and may be completely replaced by fibrous zeolites, so that it can only be recognized by the outlines of its pseudomorphs. In some phonolites it is exceedingly abundantmagnetite and zircon occur in the phonolites, and sphene is often rather common. Another mineral
The majority of the rocks of this group are of Tertiary or Recent
Recent
Cornwall
Canary
East
Leucite occurs in place of nepheline in a small group of phonolites (the leucite-phonolites), known principally from Rocca Monfina and other places near Naples. Blue hauyne is rather a conspicuous mineral
The chemical analyses of phonolites given below show that these rocks are very rich in alkalis and alumina with only a moderate amount of silica, while lime, magnesia
PHORCYS(PHORCUS, PHORCYN), in Greek mythology, son of Pontus (Sea) and Gaea (Earth), father of the Graeae, the Gorgons, Scylla, and Ladon (the dragon that guarded the golden apples of the Hesperides). In Homer (Odyssey, xiii. 96) he is an aged sea-deity, after whom a harbour in Ithaca was named. According to Varro (quoted by Servius in Aeneid, V. 824) Phorcys was a king of Corsica and Sardinia, who, having been defeated by King Atlas in a naval engagement in the course of which he was drowned, was subsequently worshipped as a marine divinity.End of Article: PHONOLITE (Gr. ~vi7, sound, and Moos, stone) If you wish, you can link directly to this article.
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