8.20 ct TYUAMUNITE IN MATRIX – USA

Tyuyamunite in Matrix (USA)

Tyuyamunite from the arid uranium districts of the American West represents the “vanadate-neon” peak of the alkaline world. A calcium uranyl vanadate, it is a species I have always respected for its “electric-canary” to “neon-greenish-yellow” saturation and its status as a masterpiece of “secondary-zone” structural discipline. For the specialist, a top-tier American Tyuyamunite is a prize of oxidized uranium focus; it offers a waxy to earthy luster and a “vibrant” presence that makes it a true “high-vibration” asset for the systematic vault. As an artist, I find the “saturated-sunlight” depth and the “sharp” contrast against dark sedimentary matrices to be one of nature’s most sophisticated and “energetic” palettes.

The Heritage & Discovery

Historical Significance Tyuyamunite is a vital species for understanding the migration of uranium and vanadium in groundwater systems. Historically, it was named in 1912 after its type locality in Tyuya-Muyun, Kyrgyzstan, but it reached its “commercial” and “mineralogical” peak during the American uranium boom. In the world of fine minerals, it is celebrated for its natural, “radioactive-neon” pigment, which stands as a symbol of chemical evolution and structural focus. It serves as a reminder that the “hidden” ore bodies of the Colorado Plateau can produce extraordinary crystalline results when alkaline fluids interact with carnotite-rich sediments.

Discovery While the species was first identified in Central Asia, the “gemmy” and “crystalline” discoveries in the United States redefined the species for the modern collector. Scientifically, it is the calcium analogue of Carnotite. Its discovery in the Four Corners region provided mineralogists with a clear look at the species’ potential for “microsheet” formations and well-defined scales. My own respect for this material grew from observing its “fluorescent” depth; specifically, the way its neon-yellow crystals handle light—often exhibiting a “sharp” (though occasionally weak) greenish fluorescence—is a visual impact that is unmistakable to the trained eye.

Important Mines The undisputed world capitals for the finest “aesthetic” Tyuyamunite in the USA are the Grants District in New Mexico and the Uravan Mineral Belt in Colorado. These specimens set the global benchmark for color purity and “crystalline” architecture within a sandstone or limestone matrix. I also have a high regard for the spectacular finds from the Small Spot Mine in Utah and the Big Indian District. For the vault, I prioritize the New Mexico material for its unmatched “neon-canary” depth and its status as a rare-location masterpiece of American radioactive mineralogy.

Mineralogical Profile

Description Tyuyamunite is a calcium uranyl vanadate that crystallizes in the orthorhombic system. It sits at a 2 on the Mohs scale, making it a delicate mineral that must be handled with extreme care to preserve its “microsheet” edges and waxy surfaces. It is characterized by its waxy to pearly luster and its unmistakable, “bright-canary to neon-yellow” color palette.

One of its most identifying traits is its tabular or micaceous habit and its association with the oxidation zones of uranium-vanadium deposits. It has a moderate specific gravity (SG approx 3.6 to 4.3) that reflects its heavy metal content. Because it forms through the alteration of primary uranium minerals, it is often found in association with Carnotite, Metatyuyamunite, and Volborthite. When I select a piece for the collection, I look for “sharp” crystalline definition and the rarest “electric-neon” saturation, as these highlight the sophisticated, three-dimensional geometry of the mineral’s growth. It is a dense, high-vibration mineral that offers a unique, “aqueous-neon” beauty unlike any other vanadate variety.

Chemical Formula Ca(UO2)2V2O8 · 5-8H2O