A beautiful example of sharp, lustrous schorl crystals aesthetically positioned on matrix.  As a mineral dealer, there are a few species you quickly learn to stay away from-- black tourmaline tops the list, but I thought these were quite exceptional, especially with the contrast offered by the vivid yellow-green, day-fluorescent hyalite highlights near top edge.  That color is best appreciated in sunlight, and you can see the glow even in shade of indirect, 4 pm winter sun (pictured).