Almandine

ppl surrounded by quartz 10*

xpl qtz and plagioclase 10*

ppl inclusions and rimming 10*

xpl off of 1 edge of garnet 10*

group                                   garnet
system                                  isometric
formula                                 Fe3Al2(SiO4)3
optic                                   isotropic
Too-Vee                                 0¡
relief.1                                high pos
min. index                              1.770 / 1.820
color                                   colorless
pleochroism                             no
birefringence.1                         no
cleavage                                no
elongation                              no
extinction                              no
angle                                   no
alteration                              chlorite, hornblend, epidote, and iron oxides
habit.1                                 euhedral (hexagonal, octagonal)
occurence                               igneous (volcanic, felsic), metamorphic (medium to high grade, pelite, mafic)
TwoV                                    
relief                                  3
pleochroism.2                           
birefringence                           
cleavage.2