On the walk to Sinnott Memorial, about halfway down the last flight of steps, there is a boulder showing mineralization. The boulder is on the outside retaining wall, and along its top surface are streaks of specularite (ferric iron oxide) and small quantities of some other mineral. A high power microscope would be necessary to determine their identity. The presence of these materials proves the presence of mineralized waters or gases emanating from fissures on Mt. Mazama. Very few secondary minerals have been reported from the rocks of Crater Lake and each new discovery may help unravel the story of the type of magma that supplied the lavas of this region.