Wavellite
Wavellite is a stunning and unique phosphate mineral famous for forming perfectly spherical, radial clusters that look like tiny, sparkling green or blue pinwheels when cracked open. Found in aluminum-rich, low-grade metamorphic rocks, it was first discovered in England in 1805 and remains a favorite among collectors for its beautiful, starburst-like crystal structures.
Illustration by Tomas Tuma
Gold
Gold (Au) is a dense, soft, and highly malleable native element mineral belonging to the transition metals group, characterized by its distinctive, lustrous yellow color and exceptional resistance to tarnish, corrosion, and most chemical reactions. Due to its scarcity, high electrical conductivity, and aesthetic appeal, it has been universally highly valued throughout human history, serving as a standard for currency, a primary material for fine jewelry, and a crucial component in modern electronics.
Illustration by Tomas Tuma
Calcite
Calcite is an extremely abundant calcium carbonate mineral that serves as the primary building block for widespread sedimentary and metamorphic rocks, such as limestone and marble, as well as the main component of stalactites and stalagmites in caves. Renowned for its extraordinary morphological diversity, it forms in hundreds of different crystal shapes and is highly famous for its optical property of double refraction, which splits light rays so that objects viewed through clear specimens appear visibly doubled.
Illustration by Tomas Tuma