Manganese dendrites in Calcite

Manganese dendrites in Calcite from Oughoud, Morocco

Small specimens of Manganese dendrites in Calcite from the region around Oughoud, Morocco.

These won't find a home in every collection - they're probably not traditionally considered all that attractive. They are striking though - the black manganese dendrites make a strong contrast with the white and grey calcite.

Being calcite, they are minorly UV reactive in some cases.