a rare synthetic Nepheline material. Chemically, it
is sodium aluminum silicate. Carnegieite is triclinic at
low temperatures and isometric at high temperatures,
possibly identical with Soda-Anorthite of S.J. Thugutt.
Carnegieite is named
for Scottish-born American industrialist, Andrew Carnegie (1835-1919)
and was first synthesized at the Carnegie Institution
of Washington, D.C. which was founded by Andrew