- Ross Hannibal Mine (North Star Mine; Hannibal Mine; and Mikado Mine), Lead District, Lawrence Co., South Dakota, USA
- Small Cabinet, 7.6 x 3.6 x 1.6 cm
Sincosite is an ULTRA RARE calcium vanadium phosphate. This superb, rich specimen has LARGE, tabular grass-green crystals to 3 mm aesthetically strewn and clustered across the matrix. The mine is now closed and this specimen was mined in the early 1990s. Ex. Tom and Melissa Campbell Collection.