Extended Data Fig. 3: Ochre piece OP2.
From: Innovative ochre processing and tool use in China 40,000 years ago
a, Ochre piece OP2, number indicates the area analyzed using SEM-EDS. b, c, SEM images of ochre piece OP2. d, µ-Raman spectrum obtained from the analysis of OP2 showing the presence of hematite (H), quartz (Q), and an undetermined manganese oxide (Und). The hematite reference spectrum is indicated in red: RRUFF ID R11001398. OP2 (11 x 8 mm in size; 0.6 g in mass) preserves at its base (at the bottom) a dark brown flat area representing the outer surface of an originally larger ochre lump of which OP2 is a small fragment. OP2 likely results from pounding that larger piece. More heterogeneous and porous than OP1, it bears no other evidence of deliberate modification.
