Nosean

1. ppl w/exsolved sulfides x10

2. xpl w/exsolved sulfides x10

3. ppl w/FeS2 inclusions x5

4. ppl nosean x5

5. xpl nosean x5

group                                   sodalite
system                                  isometric
formula                                 Na8(Al6Si6O24)Cl2
optic                                   isotropic
Too-Vee                                 0¡
relief.1                                moderate neg
min. index                              1.470 / 1.495
color                                   colorless, gray, blue
pleochroism                             no
birefringence.1                         no
cleavage                                yes
elongation                              no
extinction                              no
angle                                   0¡
alteration                              zeolites (fibrous), clay, calcite, cancrinite 
habit.1                                 equant (six-sided),  anhedral
occurence                               igneous (volcanic,alkalic)
TwoV                                    
relief                                  5
pleochroism.2                           
birefringence                           
cleavage.2                              {110} dodecahedral