The finds at the beginning of 2019 are mixed crystals between ruby and sapphire, which have different shades of color from reddish-blue to blue depending on the chromium or titanium-iron content. Interestingly, even quite blue sapphires fluoresce long under UV ("normal" sapphires do not). These corundums are almost always accompanied by massive almandine.
Here is a K level with a blue crystal
Zazafotsy, Ihosy, Madagascar
1.5" x 1"
