An UNCOMMON and very FINE Berg Aukas descloizite specimen. This STRIKING, very sturdy piece has descloizite in TWO forms and colors on the front: half is lustrous pagoda-like books of black prisms with chisel terminations and the other half is arrowhead-shaped, lustrous, flattened rust-brown crystals. The sturdy, UNUSUAL, caste matrix has a small cluster of rust-red descloizite crystals on the back. Definitely old material.