the hardness would be like a 25
Syenite is not granitic. Quartz is one of the main minerals found in granitic rock. Syenite contains little or no quartz, but otherwise has the same general composition as granite.
Syenite is not a common rock, some of the more important occurrences being in new-england, arkansas, montana, new-york(syenite gneiss), switzerland, germany, and norway
Syenites are generally formed in areas where the Earth's crust is the thickest. To produce syenite, you must melt a granitic or igneous rock so that only a portion of the rock has melted. Silica melt is produced when the melting is done slowly and at a very low temperature. This forms syenite.
Charles Jacob Koenig has written: 'Literature abstracts of ceramic applications of nepheline syenite' -- subject(s): Bibliography, Nepheline syenite, Syenite, Ceramics
silicates
Igneous Rock
Trachyite is the extrusive equivalent of syenite.
Extremely iron-rich olivine is rare, but is present in some nepheline syenite. Other minerals common in minor amounts include sodium-rich pyroxene, biotite.
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Granite, Gabbro, Diorite, Syenite, Monzonite, Tonalite
An agpaite is any of a variety of peralkaline igneous rocks, particularly nepheline syenite or phonolite.