NUSANTARA ARCHAEOMETRY & MATERIALS LABORATORY
NAML
Sample ID:
TB3-P01-GG
Material:
Green-gray inclusion isolated from ceramic body
Analytical methods:
SEM-BSE / SEM-EDS spot analysis / elemental mapping / preliminary μ-XRD
Status:
PRELIMINARY
SEM-EDS
Spot G-03 / Green-gray phase
Semi-quantitative normalized elemental composition, wt.%
(H not determined by EDS)
Element wt.%
O 48.8
Mg 15.0
Si 14.4
Fe 11.7
Al 9.3
Ca 0.4
Mn 0.2
Na 0.1
K 0.1
TOTAL 100.0
Mg / (Mg + Fe), atomic ratio:
approx. 0.75
ELEMENTAL MAPS
Si-Kα
Al-Kα
Mg-Kα
Fe-Kα
BSE image / elemental map overlay
Mg-Fe enrichment corresponds spatially with the green-gray inclusion.
The Si-Al-Mg-Fe distribution differs from that of the surrounding ceramic matrix.
μ-XRD
Green-gray fraction / Preliminary
Observed d-spacings:
14.2 Å
7.10 Å
4.75 Å
3.55 Å
Preliminary phase indication:
CHLORITE-GROUP PHYLLOSILICATE
Minor peak overlap with other clay mineral phases cannot be excluded at this stage.
PRELIMINARY MINERAL IDENTIFICATION
Chlorite-group mineral
Mg-dominant Mg-Fe chlorite
Clinochlore-chamosite compositional series
Composition provisionally consistent with clinochlore-rich chlorite
Exact chlorite species assignment remains provisional pending additional analysis.
PRELIMINARY INTERPRETATION
Green-gray inclusions occur within the ceramic body and do not appear to represent secondary surface contamination.
SEM-BSE and EDS observations indicate that the inclusions are lithic in character and contain an Mg-Fe chlorite-group phase.
The analyzed chlorite is Mg-dominant and is compositionally consistent with a clinochlore-rich member of the clinochlore-chamosite series.
The mineralogical and textural characteristics are compatible with a chlorite-bearing, hydrothermally altered volcanic lithic fragment.
At present, it cannot be determined whether these lithic inclusions were naturally present in the source clay or were deliberately added as temper during ceramic manufacture.
No provenance assignment can be made from the present data.
Further petrographic thin-section analysis, expanded XRD analysis, and comparative geological sampling will be required for mineral-phase confirmation, assessment of intentional tempering, and provenance evaluation.