Uraninite
7 in the gallery
Uraninite is a uranate mineral composed primarily of UO2, commonly forming metallic, blocky to euhedral crystals and masses with a black to grayish black color and a submetallic to resinous luster. It often occurs as inclusions in pegmatites, hydrothermal veins, and alkaline complexes, and is frequently associated with accessory minerals such as pitchblende, uraninite occurs in radiating or tabular habits and can exhibit a range of surface textures from smooth to etched. Smooth, lustrous faces and a dense feel are characteristic, and some samples may show a tarnish or slight brownish oxidation rim on exposure. The most notable specimens come from classic uraninite localities in the USA, DR Congo, Canada, Afghanistan, and Myanmar, where high-grade ore bodies yield well-formed crystals and dramatic masses.
- Formula
- UO2
- Rarity
- Common
- Stability
- Unstable
- Collector interest
- High Interest
- Classification notes
- Oxide minerals; UO2-oxide group
Where Uraninite is found
Top localities
- Badakhshan1 specimen
- Banská Štiavnica1 specimen
- Dattaw-taung1 specimen
- Schneeberg1 specimen
- Shinkolobwe Mine1 specimen
- Topsham1 specimen
About Uraninite
Collectors value uraninite for its historical significance and striking appearance in hand specimen, especially when crystals are visible within matrix or as inclusions in host rocks. Its dense, opaque darkness and occasional fluorescence under UV light can add interest to a cabinet of minerals, making it a compelling highlight for compact displays and study of ore-forming environments.