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(001) face will also show inclined extinction in monoclinic. Only (100) face will show parallel extinction in monoclinic minerals.
basal section 001 and ortho section will show straight extinction
Dear Anukruti, kindly have a look at the attached figure. Preferred direction (cleavage) on face (001) is not parallel to principal vibration direction and hence will not show straight extinction.
In monoclinic, only faces parallel to (100) shows parallel extinction.
Kindly ask if you have any further queries.