Home > Mexico II Type Locales – December 22 > MS1712 Denningite

Denningite - Sold

Denningite is a calcium manganese tellurite. Mandarino et al. (1963) named the mineral after Professor Reynolds M. Denning (1916-1967), mineralogist at the University of Michigan, Ann Arbor.

Denningite here forms a cluster of plates to 1.3 cm. This is exceptionally large for the species, but unfortunately the crystals have broken edges. The denningite here completely filled the crack in which it formed. This specimen came out in 2007, when exploration for gold around Moctezuma enabled collecting of a ton or two of tellurate bearing rock.