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countable and uncountable, plural syenites
(geology, obsolete) Granite.
(geology) An igneous rock composed of feldspar and hornblende. quotations
The temple, of which some massive hewn blocks and a fine column of Syenite granite still mark the site, occupied a terrace facing the source of the river and commanding a magnificent prospect.
1906, James George Frazer, Adonis, Attis, Osiris, page 15