* I think these are man made* Fulgurite Sphere. Also known as Lightning Glass, these delicate, root-like formations are created when lightning strikes rock, instantly melting and fusing the stone into a preserved model of the lightning.
(by Shumadra) Fulgurite is formed when lightning strikes dry quartz sand. The temperature from electrical resistance in the ground can get so high that the sand melts (about and later hardens into fragile tubes of lechatelierite [silica glass].
Wavellite: Avant Mine, Avant, Garland Co., Arkansas Dimensions x x cm. Thingofinterest: a phosphate mineral with formula F) WAVELLITE is perhaps the second best known collectable mineral in Arkansas, quartz being the first.