Fiery Opal. Very strange, I've been blocked from Tranquil Wilderness shared board Our Amazing World after pinning there for over a year. And I can't send him a message to ask if I was blocked by mistake because I'm blocked. Lesson: no more time investment in shared boards on Pinterest.
Zoisite-Tanzanite, Ca2(Al.OH)Al2(SiO4)3, also known as « Rachel » ,Merelani Hills, Arusha. Lustrous, very transparent single crystal, with very few inclusions over more than 3/4 the height, and very marked trichroism. Some graphite is attached at the base, which is characteristic of the Merelani mine. In the MIM museum.