TR13AG1: The volborthites from Milpillas are among the most spectacular mineral discoveries of the 21st century. In general, they are of exceptional quality, and in many respects, this large rosette of Volborthite crystals with Malachite and on matrix stands out above the rest. If someone wants a definitive piece, here it is.
The specimen has been reviewed, photographed and published in the magazine ‘Mineral Up’ on page 69 of the 2017/01 edition
Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora  Mexico (2015)

Specimen size: 4.9 × 3.5 × 2.2 cm = 1.93” × 1.38” × 0.87”

Main crystal size: 3.3 × 1.4 cm = 1.30” × 0.55”