Wavellite is a mineral that belongs to the phosphate mineral group. It is a hydrous aluminum phosphate mineral with the chemical formula Al3(PO4)2(OH)3·5H2O. It was first discovered in 1805 in Devon, England, and later named after William Wavell, an English physician.
Wavellite typically occurs in green to yellow-green colors, with a distinctive radial or spherical crystal habit. It forms as spherical aggregates composed of radiating acicular crystals. These radial aggregates often resemble a wheel or a wheel-like formation, hence the name wavellite.
The mineral is commonly found in oxidized limestone deposits and phosphate-rich environments. It is frequently associated with other phosphate minerals like apatite, variscite, and turquoise. Wavellite is primarily formed through chemical weathering and alteration of aluminum-bearing minerals.
Wavellite is valued by mineral collectors for its unique crystal habit and vibrant coloration. It is known for its characteristic apple-green to olive-green hues, although less commonly, it can occur in white or brown colors. Wavellite crystals have a vitreous to pearly luster and are translucent to transparent.
In terms of its properties, wavellite has a Mohs hardness of 3.5 to 4, which makes it relatively soft. It has a specific gravity ranging from 2.3 to 2.4. When exposed to heat, wavellite may lose its water content and crumble. Additionally, it may fluoresce under ultraviolet light.
Overall, wavellite is an aesthetically pleasing mineral found in phosphate-rich environments, valued for its radial or spherical crystal habit and vibrant green color.
