0.03 ct WHEWELLITE – GERMANY

Wavellite (USA – Arizona)

Wavellite from the remote mining districts of Arizona represents the “aluminum-phosphate-spherical” peak of the phosphate world. A hydrated aluminum phosphate hydroxide mineral, it is a species I have always respected for its “mint-neon” to “pale-champagne” saturation and its status as a masterpiece of “orthorhombic” structural discipline. While Wavellite is globally celebrated for its vibrant green radiating spheres from classic localities like Arkansas, the rare occurrences in Arizona offer collectors a distinctly unique expression of this mineral’s habit. For the specialist, a top-tier Arizona Wavellite is a prize of specialized supergene fluid localization; it offers a vitreous to pearly luster and a “radiant” presence that makes it a true “high-vibration” asset for the systematic vault. As an artist, I find the contrast between the “aqueous-green” or “pearly-cream” globule crusts and the rugged, iron-stained host matrix to be one of nature’s most sophisticated and “sculpturally organic” palettes.

The Heritage & Discovery

Historical Significance Wavellite is a vital species for understanding the concentration and crystallization of aluminum and phosphorus in the secondary oxidation zones of rock fractures. Historically, it was named in 1805 after the English physician William Wavell, who first discovered the mineral in Devon, England. In the world of fine minerals, it is celebrated for its natural, “radiating-botryoidal” brilliance, which stands as a symbol of growth, symmetry, and structural integrity. It serves as a reminder that when phosphate-rich groundwater trickles through aluminum-bearing host rock under low-temperature conditions, it can organize into extraordinary needle-like crystalline clusters that grow outward from a single point.

Discovery While classic hemispherical green wheels are found in Arkansas and Germany, the distinct “desert-basin” discoveries in Arizona provided mineralogists with an intriguing variation in both color and matrix association. Scientifically, it is a basic aluminum phosphate. Its discovery within specific mineralized veins and mining districts in Arizona yielded microcrystalline aggregates and small, highly lustrous radiating crusts that show a different crystalline development compared to standard shale-hosted specimens. My own respect for this material grew from observing its “internal” depth; specifically, the way the fibrous, acicular crystals catch light beneath a rounded, globular surface—creating a soft, pearly chatoyancy—is a visual impact that is unmistakable to the trained eye.

Important Locations While exceedingly scarce compared to copper minerals, the finest “aesthetic” Wavellite specimens in Arizona have emerged from specialized micro-pockets within the Castle Dome District in Yuma County, and the historic mineral veins of Gila County and Pinal County. These desert-basin specimens set a unique regional benchmark for luster and dense, spherical architecture, often found lining the vugs of highly fractured quartz or brecciated iron oxide matrices. For the vault, I prioritize these Arizona pieces for their unmatched mineralogical rarity and their status as a rare-location masterpiece of the American Southwest’s secondary phosphate chemistry.

Mineralogical Profile

Description Wavellite from Arizona is a hydrated aluminum phosphate hydroxide that crystallizes in the orthorhombic system. It sits at a 3.5 to 4 on the Mohs scale, making it a relatively soft mineral whose delicate radiating needles and rounded globular crusts must be handled with care and protected from physical abrasion to preserve their vitreous to pearly surfaces. It is characterized by its vitreous luster, which becomes strongly pearly on internal cleavage planes, and its unmistakable “pale-green, yellow, to cream-white” color palette.

One of its most identifying traits is its perfect radiating hemispherical or globular habit, which reveals a brilliant starburst or wheel-like internal structure when a sphere is broken open. It possesses a moderate refractive index running from approximately 1.52 to 1.55, contributing to its soft internal glow, and a light specific gravity (SG approx 2.3 to 2.4) that reflects its highly open, water-rich phosphate framework. Because it forms as a secondary mineral in altered rocks, it is often found in close association with Quartz, Variscite, Turquoise, and Limonite. When I select a piece for the collection, I look for pristine, unbroken globule domes and clear, sharp radiating patterns, as these highlight the sophisticated, three-dimensional geometry of the mineral’s growth. It is a light, high-vibration mineral that offers a unique, “aqueous-neon” structural beauty unlike any other phosphate variety.

Chemical Formula Al3(PO4)2(OH,F)3 · 5H2O