The rock was syenite, so weathered as to resemble sandstone.
The complete gradation from syenite to bauxite has been shown.
Here the magnetite forms a great tabular vertical body lying between porphyry and syenite.
They sought no quarried blocks of syenite or granite for their work.
We ascended a ridge bristling with syenite boulders of massive size, appearing above a forest of dwarf trees.
In syenite and greenstone it occurs more commonly than orthoclase.
syenite usually does so in our damp climate, from the “weathering” effect of frost and rain: why has it not done so over the lake?
syenite, like granite, is recognised as an igneous as well as a metamorphic rock.
The syenite granite was very hard, and capable of taking a high polish.
What is the mineralogical composition of syenite and diorite?
A light-colored, coarse-grained igneous rock consisting primarily of alkali feldspar together with some mafic minerals, especially hornblende. Unlike most igneous rocks, syenite has little or no quartz. It is believed to form from the cooling of magma that forms at very high temperatures and at great depths. It is the coarse-grained equivalent of trachyte.