Image: James St. John (CC BY 2.0)
amorphousuncommonSecondary Uranium Minerals (mix of oxides, silicates, carbonates)
Gummite
A complex mix of secondary uranium minerals (oxides, silicates, carbonates)
Gummite is a radioactive, yellowish- to orangish-colored mix of uranium-bearing minerals. It is fine-grained, massive, and somewhat tacky, often with black grains of unaltered uraninite.
Gummite Physical Properties
Crystal System
amorphousLuster
vitreousStreak Color
yellowish-orangeCleavage
noneFracture
unevenColors
yellowish, orangeTransparency
opaque to translucentType Locality
Ruggles Mine, Grafton Center, New Hampshire, USAMineral Group
Secondary Uranium Minerals (mix of oxides, silicates, carbonates)Uses
collector's item, scientific studyAssociated Minerals
uraninite, fourmarierite, clarkeite, kasoliteRarity
uncommonGeological Context
Gummite forms as a secondary alteration product in the oxidation zone of uranium deposits, resulting from the oxidation of primary uraninite (uranium dioxide).
