Romanèchite, Todorokite, Calcite
Hufgard quarry, Feldkahl, Hösbach, Aschaffenburg District, Lower Franconia, Bavaria, Germany
According to Spessart expert LORENZ, the black masses consist of poorly crystallized romanèchite with contents of todorokite. Not rare at the quarry, but due to its fragility hard to recover. That's why there is still some dust left on the specimen - water or any other way of cleaning would destroy the dendrites.
Setup:
Nikon D90, bellows, ...
© Meinrad Kempf