Associated minerals are: scholzite, tarbuttite, parahopeite
, zincian collinsite, switzerite and phosphophyllite.
Chuck Trantham recalls that Jack collected nissonite at the type locality in San Benito County, California, with Charles Chesterman, pumpellyite and omphacite near Cazadero, California, with George Switzer and Al McGuinness, and parahopeite
at Broken Hill, Zambia, with Al McGuinness and Luis Leite.
Mennell's principal "rare minerals" were undetermined grayish copper phosphates which could not be collected free from parahopeite
admixture (copper is very scarce in Broken Hill ore, and therefore greenish and bluish traces stand out).