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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Saurabh 1 Best Answer
Yes they do exist in crystallography (in monoclinic). Clearly from the figure you can see some parallel faces meeting at a point and forming a structure like cube or parallelopiped (in some books but don't get confused because paralleopiped is quite similar to cuboid not cube). Those parallel face have some well defined name, that is -- Pinacoids. And I assume that you might be knowing about the pinacoids (as they are majorly find in monoclinic).