This material, I am told, came from one pocket in the late 1970s. I have seen only 3 specimens for sale out there. All 3 I have seen feature very unusual wheat-sheaf-like apatite crystals of a pastel yellow hue, in association with ferberite. More interestingly, they also have small 1-3 mm crystals of faintly blue topaz in association, as this one does scatterred about on the ferberites! This is an excelleent example of a rare association!