Schmitterite is a radioactive mineral and should be stored away from minerals that are affected by radioactivity and of course human exposure should be limited. Color is colorless to yellowish. Luster is pearly. Crystals are transparent to translucent. Crystal Habits include small granular crystals and massive.
Cleavage is good in one direction.
Hardness is 1. Streak is white. Specimens are somewhat radioactive. Associated Minerals include various other tellurium minerals such rodalquilarite , emmonsite and other tellurates and tellurites . Notable Occurrences are limited to the type locality of Moctezuma Mine and the Bambollita Mine of Moctezuma, Sonora, Mexico .