group feldspathoid
system isometric
formula (Na,Ca)4-8(Al6Si6O24)(SO4)1-2
optic isotropic
Too-Vee no
relief.1 mod neg
min. index 1.494
color colorless, blue, green
pleochroism no
birefringence.1 0.000
cleavage no r {001} dodecahedral cleavage which is not obvious
elongation no
extinction no
angle no
alteration zeolites, clay, calcite, or cancrinite
habit.1 equant, granular, octahedrons
occurence igneous (volcanic, alkalic)
TwoV
relief
pleochroism.2
birefringence
cleavage.2