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Encyclopedia Britannica - Main :: SUS-TAV |
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SYENITE , a name first used by Pliny to designate rocks of the same type as the hornblendic granite of Syene (Assouan) in Upper Egypt
work
rock
appearance , though not identical in mineralogical character with the Egyptian granite, from the Plauen 'scher Grund near Dresden, it is now used as the group name of a class of holo-crystalline plutonic rocks composed essentially of an alkali felspar and a ferromagnesian mineral
appearance are very much the same as that of a hornblendic granite; from which it is difficult to distinguish these rocks in hand specimens. The important difference, however, is the absence or scarcity of quartz in the syenites. Their essential components are orthoclase, often with some albite, and augite, hornblende or biotite. The orthoclase is white or pink
rock
andesine
alkalis. The augite is usually pale
The accessory minerals include sphene (very frequent), End of Article: SYENITE If you wish, you can link directly to this article.
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