0%; there are no particles that are non-cubic in sample 2.
The IA L/T index of 3 would correspond roughly to limit
between cubic and non-cubic particles. The amount of noncubic
particles according to the IA results of the 10 images
varies somewhat. For sample 1 the results vary between 3%
and 10% non-cubic particles and for sample 2 between 0%
and 3% non-cubic particles (Fig. 7). This is in very close
agreement to the DB estimation. Fernlund [6] discussed this
larger variability of results for the largest particles. It was
suggested that this is a result of random placement of the
particles in the image. Large particles in the outer edges of
the image will be distorted more than smaller particles. Thus
it is recommended that the largest particles be placed near
the center of the images. Theoretically is should also be
possible to correlate the IA results with the shape index.