Syenite.

Name: The Student’s Elements of Geology - Syenite.
Author: Charles Lyell

We now come to the second division of the Plutonic rocks, or those having less than 60 per cent of silica, and which, as before stated, are usually called syenitic. Syenite originally received its name from the celebrated ancient quarries of Syene, in Egypt. It differs from granite in having hornblende as a substitute for mica, and being without quartz. Werner at least considered syenite as a binary compound of feldspar and hornblende, and regarded quartz as merely one of its occasional minerals.

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Chicago: Charles Lyell, "Syenite.," The Student’s Elements of Geology, ed. Bryant Conant, James and trans. Babington, B. G. (Benjamin Guy), 1794-1866 in The Student’s Elements of Geology Original Sources, accessed March 27, 2025, http://www.originalsources.com/Document.aspx?DocID=54TA33N3AI6UI1P.

MLA: Lyell, Charles. "Syenite." The Student’s Elements of Geology, edited by Bryant Conant, James, and translated by Babington, B. G. (Benjamin Guy), 1794-1866, in The Student’s Elements of Geology, Original Sources. 27 Mar. 2025. http://www.originalsources.com/Document.aspx?DocID=54TA33N3AI6UI1P.

Harvard: Lyell, C, 'Syenite.' in The Student’s Elements of Geology, ed. and trans. . cited in , The Student’s Elements of Geology. Original Sources, retrieved 27 March 2025, from http://www.originalsources.com/Document.aspx?DocID=54TA33N3AI6UI1P.