Table 1 Results of grave goods analyses by SEM-EDX and μXRD

Black

M1

CA15-C

Pigment in a shell

Mn, Si, Ca, K, Al, Fe, Mg, Cl, S, Na

Manganese crystals not clearly observed (mixed with the other compounds)

Cryptomelane, quartz, anhydrite, calcite, diopside

M17

MO-1 Tumba 25 Cuerpo 5

Pigment in a shell

Mn, K, Si, Ca, Cl, Al, P, S, Na

Manganese as 2-3 μm long grains

Cryptomelane, halite, quartz, calcite, albite

Red

M1

MASMA-1

Raw Pigment

Fe, Si, Al, Ca, Cl, Na, trace of As

Hematite spherical grains, 10 μm in diameter or ovoide grains (1 μm thick)

Hematite, halite, kaolinite?

M8

CA15-C, Cuerpo 3

Raw pigment

Fe, Si, Al, Cl, K, S, Na, trace of As

Hematite spherical grains, 1 μm in diameter

Hematite, goethite, halite, quartz, calcite

M10

COLON-10

Pigment in a shell

Si, Fe, Ca, S, Al, Cl, K, Na, trace of As

Hematite ovoid grains, 1 μm thick

Hematite, quartz, halite, anhydrite

M11

MASMA

Pigment on a griding stone

Fe, Si, Ca, Al, Cl, trace of As

Hematite pherical grains, 10 μm in diameter or ovoide grains, 1 μm thick

Hematite, halite, kaolinite

M13

CA15-C

Powder in a leather pouch

Si, S, Fe, Ca, Al, Cl, Na, trace of As

Hematite cryslats with facets, 2-7 μm long and ovoid grains (1 μm thick)

Hematite, quartz, calcite, halite

M14

CA15-D

Raw pigment

Fe, Si, Al, K, Na, Cl, Ca, trace of As

Hematite spherical grains, 10 μm in diameter or ovoide grains (1 μm thick)

Hematite, halite, diopside? illite?

M16

CHIN-4

Raw pigment

Fe, Si, Al, S, P, K, Na, Ca

Hematite ovoid grains, 1 μm thick

Hematite, gypsum, quarz, halite, calcite?