Phase diagram
The thermochemical behaviour for North Cape Nepheline Syenite is shown on the phase diagram where North Cape Nepheline Syenite, according to its chemical composition, is plotted at point(+). This point lies on the line between the mineral feldspar and the mineral nepheline. it can be seen that nepheline and silica are not coexistent at high temperatures. They react readily,thus forming feldspar. this is one of the main reasons for the high dissolution rate of quartz in the glass matrix of a ceramic body containing North Cape Nepheline Syenite. |
