It can be quite hard to pick out a single dark crystal on a generally all over dark specimen!
Here is an example of a dark blue anatase crystal on a specimen that is on a matrix of mostly dark green chlorite. The specimen also contains cassiterite, albite and quartz.
Anatase is a titanium oxide and can occur in equant crystals in a range of colours.
Ex Bernie and Margaret Day Collection. The label on the base of the box is in Chris Jewson’s handwriting, and was collected around 2001.
Width of view 3.5mm. Stack of 65 images. Steve Sorrell collection and photo.