Wavellite, Al3(PO4)2(OH,F)3.5(H2O) (Hydrated Aluminium Phosphate Hydroxide), is a mineral that demonstrates the classic botryoidal crystal habit. It produces a unique effect when the globules are imbedded in rock and then fractured. The result is a radial cluster which reflects light to produce a sparkling pinwheel effect.

Description: An angular grey matrix on which sit two fused spheres of Wavellite. The colour is the classic apple green and both have a waxy luster making for a very attractive specimen. There are also a number of small part-spheres and rosettes. The surface of the matrix is covered by by a grey siliciate-type mineral which presents a very attractive contrast to the green Wavellite.

Location: Wisniowka, Poland.