Gadolinite-Y

specimen number:
2262253

location:
Mohave Co., Arizona, USA

description:
A neat set of four loose massive gadolinite specimens with an old label and history. Very neat from the locality and species. Size provided is the size of the box as shown in the picture and video.

The Mohave County gadolinite-Y deposits, situated primarily within the rugged Cerbat Mountains and the Aquarius Range in northwestern Arizona, represent some of the most mineralogically significant occurrences of rare-earth element (REE) minerals in the American Southwest. Geologically, this uncommon yttrium iron beryllium silicate mineral is hosted within complex, highly fractionated Proterozoic-age granitic pegmatites that intrude ancient granites and gneisses. The gadolinite-Y crystallized as a primary accessory phase from highly evolved, volatile-rich residual magmas, forming distinctive, dull black to greenish-black masses, rough nodules, and occasionally large prismatic crystals embedded within a coarse matrix of microcline feldspar, quartz, and biotite mica. Historically, these remote pegmatites were initially prospected for feldspar, mica, and quartz around the turn of the 20th century. However, dedicated small-scale mining and quarrying specifically targeting gadolinite-Y and other rare-earth minerals commenced in the 1940s and spiked during the 1950s, driven by intense Cold War demand for specialized strategic and industrial materials at notable claims like the Kingman Feldspar mine and the Rare Metals mine. These localized, hand-dug operations were conducted sporadically into the 1960s before declining demand for raw pegmatite ores and high processing costs brought a permanent end to commercial rare-earth mining in the district by the early 1970s.

Dr. George Therald Moeller (1913-1997) was a world-renowned American inorganic chemist and academic professor whose pioneering research significantly advanced the modern understanding of rare-earth elements. Born in Oregon, he earned his doctorate from the University of Wisconsin in 1938 and subsequently built a distinguished teaching career, serving on the faculty at the University of Illinois Urbana-Champaign from 1940 to 1969 before anchoring the chemistry department at Arizona State University from 1969 until his retirement. Moeller became a primary global authority on the coordination chemistry, aqueous behavior, and separation methodologies of the lanthanide series, authoring the seminal 1952 textbook "Inorganic Chemistry: An Advanced Text," which helped revitalize the discipline across the United States. His sophisticated chemical frameworks and fundamental studies on rare-earth ion solubilities heavily influenced mid-20th century industrial metallurgy, providing critical data utilized by organizations like the United States Bureau of Mines to develop practical ion-exchange techniques for purifying complex rare-earth minerals.

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