Image: James St. John (CC BY 2.0)
amorphousuncommonSecondary Uranium Minerals (mixture)
Gummite
A complex mixture of secondary uranium minerals (oxides, silicates, carbonates) derived from UO2
Gummite is a radioactive, yellowish- to orangish-colored, fine-grained, massive, and somewhat tacky mixture of uranium-bearing minerals.
Gummite Physical Properties
Crystal System
amorphousLuster
resinousStreak Color
yellowish-orangeCleavage
noneFracture
unevenColors
yellowish, orangishTransparency
opaqueType Locality
Ruggles Mine, Grafton Center, New Hampshire, USAMineral Group
Secondary Uranium Minerals (mixture)Uses
scientific study, mineral collectionAssociated Minerals
uraninite, fourmarierite, clarkeite, kasoliteRarity
uncommonGeological Context
It forms as a secondary alteration product through the oxidation of primary uraninite (UO2), often containing unaltered uraninite grains.
