Coffinite from the Monument #2 Mine, AZ, USA – micromount as unique piece
This micromount specimen with Coffinite from the Monument #2 Mine, Arizona, USA, displays a dark, compact form with a slightly lustrous to matte surface. The elongated, somewhat prismatic piece stands out clearly with its deep black to brownish black coloration against the light background of the display box.
The Coffinite crystals are developed as fine crystalline aggregates and are not visible as distinct individual crystals. However, the crystalline nature is clearly recognizable through the structured surface. The uniform and compact habit gives the specimen a distinctive and typical appearance for this rare uranium mineral.
Geology & Origin
Coffinite is a uranium silicate that forms in hydrothermal uranium deposits, often associated with organic material and reducing conditions. The Monument #2 Mine in Arizona is a classic locality for uranium minerals within the Colorado Plateau. The formation of this specimen reflects such geochemical conditions and is characteristic of secondary uranium mineralization.