Uraninite on Quartz (Czech)

A genuine uraninite specimen from the Czech Republic featuring dark uranium-bearing mineralisation hosted within a contrasting matrix of cream-white crystalline gangue minerals and quartz-rich material. The specimen displays attractive black uraninite-rich seams and patches cutting through the lighter host rock, creating exceptional visual contrast and highlighting the geological processes responsible for the formation of this historic uranium ore.

Under magnification, the specimen reveals a fascinating mineral assemblage consisting of lustrous black uraninite mineralisation, translucent to opaque quartz-rich crystals, and white secondary mineral coatings distributed throughout the matrix. The uraninite occurs as dark veins and irregular masses between the crystalline gangue minerals, producing a striking natural appearance highly desirable to collectors of radioactive minerals and classic European uranium specimens.

Microscopic examination also reveals delicate fibrous mineral growths occurring within portions of the specimen. These fine white fibres may represent an asbestiform mineral habit commonly encountered within hydrothermal uranium-bearing vein systems. While present only in very small amounts, these naturally occurring fibrous features add further geological interest to the specimen. As with all mineral specimens containing unidentified fibrous minerals, handling should be minimised and the specimen should remain within its display box whenever possible.

Under ultraviolet light, the specimen exhibits scattered areas of bright green fluorescence associated with secondary uranium mineralisation. These fluorescent zones provide excellent visual contrast against both the dark uraninite-rich sections and the pale crystalline matrix, enhancing the specimen's display appeal and demonstrating the presence of uranium alteration products formed during natural weathering processes.

The combination of uraninite mineralisation, contrasting crystalline host rock, fluorescent secondary uranium minerals, and interesting microscopic textures makes this an attractive collector specimen from one of Europe's most historic uranium-producing regions.

The specimen measures approximately 40× 35 × 20 mm, weighs approximately 32.9 grams, and is supplied in a protective acrylic display box, ready for display, storage, or collection.

Specifications

Equipment Used To Measure: RADEYE B20-ER

Activity Including (Alpha, Beta & Gamma): 20,000cpm

Mineral: Uraninite (Pitchblende)

Formation: Uraninite with Secondary Uranium Mineralisation

Origin: Czech Republic

Weight: Approx. 32.9g

Size: Approx. 40 × 35 × 20 mm

Display: Includes Acrylic Display Box

Features: Natural Uraninite Mineralisation • Quartz-Rich Crystalline Matrix • Green Fluorescent Secondary Uranium Minerals • White Secondary Mineral Coatings • Minor Fibrous Mineral Growths • Historic Uranium Mining District Specimen

Collector Specimen ☢️

Each specimen is completely natural and unique, preserving mineralogical features formed over millions of years within one of Europe's most famous uranium-producing regions. This specimen offers an excellent combination of dark uraninite mineralisation, attractive crystalline gangue minerals, fluorescent secondary uranium minerals, and intriguing microscopic textures. A remarkable example of natural uranium mineralisation and an outstanding addition to any radioactive mineral, uranium ore, fluorescent mineral, or geological collection.