American Heritage® Dictionary of the English Language, Fourth Edition
- n. An igneous rock composed primarily of alkali feldspar together with other minerals, such as hornblende.
Century Dictionary and Cyclopedia
- n. A rock composed of feldspar and hornblende, with or without quartz. The name syenites was given by Pliny to the red granitoid rock extensively quarried at Syene in Egypt. The term syenite was introduced into modem geological science by Werner, in 1788, bur. applied by him to a rock (from the Plauenscher Grund, near Dresden) not identical in composition with the syenites of Pliny, which latter is a hornblendic granite, or granite in which mica is replaced by hornblende, whereas the rock which Werner called
syeniteis mainly made up of a mixture of feldspar and hornblende; hence there has long been more or less confusion in regard to the nomenclature of this rock. The English and some continental geologists have defined syenite as an aggregate of quartz, feldspar, and hornblende; while the Germans have generally regarded the quartz as not being an essential constituent of the rock: this latter view is that which has been adopted in the most recent English geological and lithological works. Syenite is a rock thoronghly crystalline in texture, and in general it much resembles granite in its mode of occnrrence. The feldspathic ingredient is chiefly orthoclase, and this usually predominates considerably in quantity over the associated minerals; there is some triclinic feldspar present, however, in most syenites, and the same is true in regard to quartz, biotite, titanite, magnetite, apatite, zircon, and various other accessory minerals frequently found in small quantity in the granitic rocks. Sometimes the hornblende is replaced by augite; this variety is designated augite-syenite; that in which mica predominates is known as mica-syenite or minette. The range of syenite in geological age is similar to that of granite, and the frequent passage of one rock into the other shows how closely allied the two are, one result of which condition is that the nomenclature of the different varieties is correspondingly difficult. Typical syenite is by no means abundant, and in general the granitic rocks very considerably surpass the syenitic in economic importance. Also sienite.
- n. In the quantitative system of classification (see rock), a proposed general field-term for a phaneric igneous rock composed of dominant feldspar of any kind, with subordinate amounts of mica, hornblende, pyroxene, or other minerals, and without a noticeable amount of quartz
GNU Webster's 1913
- n. Orig., a rock composed of quartz, hornblende, and feldspar, anciently quarried at
Syene, in Upper Egypt, and now called granite.
- n. A granular, crystalline, ingeous rock composed of orthoclase and hornblende, the latter often replaced or accompanied by pyroxene or mica. Syenite sometimes contains nephelite (elæolite) or leucite, and is then called
nephelite (elæolite) syeniteor leucite syenite.
- Latin Syenites, because anciently quarried at Syene in Egypt. (Wiktionary)
- Latin Syēnītēs (lapis), (stone) of Syene, from Syēnē, Syene, an ancient city of southern Egypt, from Greek Suēnē. (American Heritage® Dictionary of the English Language, Fourth Edition)
“Is it real science -- or what is it -- which would label syenite”
Practical Taxidermy A manual of instruction to the amateur in collecting, preserving, and setting up natural history specimens of all kinds. To which is added a chapter upon the pictorial arrangement of museums. With additional instructions in modelling and artistic taxidermy.
“Its quarries, with those of Rohannou, were the principal ones of Egypt; they supplied a certain kind of red granite called syenite, out of which were cut the obelisks, monolithic temples, the colossus, etc.”
“It is a portion of the great marine glacial drift of the midland counties of England, and contains blocks, some of large size, not only of the Oolite of the neighbourhood, but of Chalk and other rocks transported from still greater distances, such as syenite, basalt, quartz, and New Red Sandstone.”
“Canadian feldspar nepheline syenite is sometimes used to lower bisk firing temperatures.”
“Mount Warning itself represents the original neck of the volcano which, being more resistant (comprising syenite, gabbro and monzonite) than the surrounding basalt and rhyolite, remains as an isolated plug.”
“Mount Mulanje consists of a cluster of coalescing plutonic intrusions of syenite, quartz-syenite and granite, which are uplifted and faulted.”
“Then he passed through the gate into a courtyard and found a vaulted doorway builded of hardest syenite 462 inlaid with sundry kinds of multi-coloured marble.”
“In the second Pyramid are the records of the priests, written on tablets of syenite, to each priest his tablet, whereon are engraved the wonders of his craft and his feats; and on the walls are the human figures like idols, working with their hands at all manner of mechanism and seated on stepped thrones.”
“The ancients say that, in the western Pyramid, are thirty chambers of parti-coloured syenite, full of precious gems and treasures galore and rare images and utensils and costly weapons which are anointed with egromantic unguents, so that they may not rust until the day of”
“After following the auction for a week and not bidding, Beals, an Easton resident, snatched the piece of Plymouth syenite with just four seconds remaining, beating out bidders who had sought the famed rock since it was first offered on the Internet auction site a week ago.”
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