April 2026 – Wavellite

In what we hope will be a very sunny April, we present a mineral that often forms radiant ‘suns’ itself: wavellite. (Chemical formula: Al₃(PO₄)₂(OH,F)₃ · 5H₂O)

Wavellite very often forms yellowish to greenish, radiant aggregates. These ‘crystal balls’ frequently grow on fissures in sandstone, as is the case with our specimen from the USA.

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

Location: Garland County, Arkansas, USA