Hypersthene

" ""porphyroblast

ppl matrix 5*

xpl 5*

ppl 5*

xpl 5*

ppl 10*

1. ppl hypersthene east-west x5

2. ppl hypersthene north-south x5

3. xpl maximum birefringence x5

4. xpl extinction x5

group                                   pyroxene
system                                  orthorhombic
formula                                 (Mg,Fe)2Si2O6
optic                                   biaxial neg
Too-Vee                                 50 - 132¡
relief.1                                moderate to high pos
min. index                              1.649 / 1.788
color                                   green, pink, brown
pleochroism                             yes
birefringence.1                         0.007 - 0.020
cleavage                                yes 
elongation                              yes
extinction                              parallel, symmetrical
angle                                   0¡
alteration                              serpentine, talc, or fine-grained amphibole
habit.1                                 prismatic, columnar, tabular
occurence                               igneous (ultramafic, mafic), metamorphic (high grade)

TwoV                                    1 2 3 
relief                                  2 3
pleochroism.2                           pink, yellow, brown
birefringence                           1 3 4 5 6    7 8
cleavage.2                              {210} prism faces intersect at 88¡