Lead and Strontium Isotopes Trace Ancient Pueblo Azurite

A new study tests whether archaeologists can identify the geological sources of blue azurite pigment used by Ancestral Pueblo people in the Four Corners region.

Updated on Nov. 9, 2026 in Geology

Close view of a rough blue azurite mineral chunk on a dark slate slab, with a red sandstone mesa softly blurred behind it. — Researchers used lead and strontium isotopes to trace most ancient Ancestral Pueblo azurite pigment to Lisbon Valley, Utah, in a new study. AI Illustration. Upload story photo >

Researchers published a study in the Journal of Archaeological Science: Reports testing whether archaeologists can determine where ancient Pueblo azurite came from. Isotopic analysis of 12 archaeological specimens linked most samples to Lisbon Valley, Utah, while two came from the Zuni Mountains of New Mexico.

Why it matters

Azurite, a vivid blue copper mineral, was used by Ancestral Pueblo people for at least 1,400 years, and tracing its origins could reveal patterns of trade and resource use. The findings show lead and strontium isotopes are the strongest tools for linking the pigment to its geological source.

The study analyzed 12 archaeological azurite specimens using lead, strontium and copper isotopes, with lead and strontium proving most useful for source identification. Copper isotopes could not separate the sources, and the small sample size leaves the broader pattern of azurite sourcing still to be confirmed.

The players

Schleher

Lead researcher on the azurite sourcing study, who plans to test more samples to expand the azurite source database.

Thibodeau

Co-researcher on the azurite sourcing study, working with Schleher to increase the sample size for isotopic comparisons.

The details

Azurite samples were collected from geological sources in New Mexico and Utah that Ancestral Pueblo people previously mined, and the team compared archaeological specimens against these reference samples using isotopic measurements. Most specimens likely came from Lisbon Valley near present-day Moab, Utah, while the two New Mexico specimens originated in the Zuni Mountains.

At least 1,400 years ago: Ancestral Pueblo people began using azurite as a pigment.
By about A.D. 600: Pueblo communities were using azurite from both Lisbon Valley and the Zuni Mountains.
Study publication reported by phys.org on 2026-11-09.

Big Picture

The study applies lead and strontium isotope sourcing, a method long used to trace archaeological materials to their geological origins, to ancient azurite pigment in the Four Corners. It shows that copper isotopes alone cannot separate pigment sources, pointing to lead and strontium as the more reliable tracers for this kind of work.

Better source tracing for pigments like azurite could eventually help archaeologists map ancient trade routes and resource use across the Southwest. The method may also inform how museums and researchers verify the origins of cultural objects.

The takeaway

Lead and strontium isotopes offer a dependable way to connect ancient pigments to their geological sources, while copper isotopes alone may not be enough. As testing expands, the source database could reveal more about how Ancestral Pueblo communities moved and traded materials.