Present in Michigan County: None; Geological Formation: ; Specific Mine Name: None; Commercial Mining History: None; Published Literature: ; Unpublished Literature: ; Comments: None reported in Michigan; USGS Critical Mineral Reference: Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds.,2017, Critical mineral resources of the United States�Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, 797 p., http://doi.org/10.3133/pp1802.