However, in these cases it becomes important to also be sure of the " optic sign " of the mineral ( essentially, this tells you how the optic angle is orientated with respect to the whole optical indicatrix describing the refractive indices of the mineral in 3D ).
12.
In thin sections cut parallel to the fibers, ulexite grains display both length-fast and length-slow orientations in equal quantities because the intermediate axis ( y ) of the indicatrix is roughly parallel to the elongation of the fibers along the crystallographic c-axis ( Moore and Potter, 1963 ).
13.
More simply, in ordinary cross polarized light, the plate can be used to distinguish the orientation of the optical indicatrix relative to crystal elongation-that is, whether the mineral is " length slow " or " length fast "-based on whether the visible interference colors increase or decrease by one order when the plate is added.
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