Lepidomelane Mica

Lepidomelane mica, Haute-Vienne, France. Four fragments of black mica, the largest measuring 7 × 4.5 cm, of lepidomelane mica. Lepidomelane is a mineralogical term referring to a black, iron-rich mica. It is often regarded as a dark variety of biotite or as a field name for black micas that have not been precisely analysed, encompassing species such as annite or siderophyllite. Handwritten label: Boubée collection