These crystals are all crossite / schist included.

They are sometimes referred to as Rockys or Stoneys.

The reason these are not gem quality is because these benitoite crystals absorbed some of the surrounding matrix minerals when they were forming.

Each Crystal is unique in it's own way. The photo shows the grouping you are purchasing.

The crystals may show various growth forms. Some may be tabular, hexagonal, dipyramidal-ditriagonal, some may just show modified faces and or terminations. 

These have only been rinsed in water so as you can see, there may be a little dirt present on some of them, but overall pretty clean.