TH26S3: A novelty at Tucson 2010. With the exceptional Tanzanite with Prehnite also appeared from Merelani some crystals of Diopside of notable size. This one has an excellent development of the upper terminal faces. It is transparent with an intense color and has an associated curious dark Titanite crystal that we analyzed. It also has small crystals of graphite on the back side.
Merelani Hills, Lelatema Mountains, Simanjiro District, Manyara Region  Tanzania (2010)

Specimen size: 4.4 × 2.5 × 1.7 cm = 1.73” × 0.98” × 0.67”

Main crystal size: 3.2 × 1.6 cm = 1.26” × 0.63”