Not required for students of EPS2
Light Behavior | anisotropic-biaxial |
Extinction | parallel |
Color/Pleochroism | colorless to pale yellow/none |
Birefringence | up to third-order |
Relief | high positive |
Optic Sign | + or - |
Cleavage | none |
2V | 46-98 degree |
Crystal Form | anhedral grains, zoning common |
Alteration Products | serperntine |
Twinning | none |