These large, sharp crystals are often called "tanzanite fluorites" in China for their unusual strong color, and that they do change color between sunlight and internal light to different hues ranging from blue-purple to purple. This is a large crystal measuring in at just over 5 cm across, perched atop smaller crystals. It has some contact in the bottom and the back, but is complete where it matters and presents that large, gemmy crystal front-and-center! These came out in 2017, and not since. The major crystal is fully terminated, even on top, and the photos here show it in different degrees of backlighting.