Mineralpedia Details for Wightmanite
Wightmanite is named for Randall H. Wightman, the mining and exploration director at the Riverside Cement Company in Riverside, California, USA where Wightmanite also has its type locality. Found only in California, Wightmanite is a rare mineral that occurs only in contact metamorphosed limestone.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/wightmanite.pdf