Energized by exploring the characteristics of obsidian, Francisco Sotomayor combines artistry with technology to sculpt 12 pieces with images in each. Driven by curiosity, the sculptor embarked on a ...

Tesserae from the mosaic on the front of the San Giovenale chapel inside the Narni Cathedral were analyzed through non-destructive XRF analysis for the characterization of both colouring matters and ...

For the ancestral peoples of the Pacific Coast, obsidian (volcanic glass) was a highly valued raw material because it could be used to make razor-sharp cutting tools. However, for many parts of the ...

X-ray technology has allowed researchers a glimpse at the reaches of the Yellowstone landmark’s prized stone and its importance to Indigenous people. By Jim Robbins YELLOWSTONE NATIONAL PARK, Wyo. — ...

Identifying minerals blends careful observation with dependable tests that reveal each specimen’s unique signature. Geologists examine hardness, streak, luster, cleavage, and crystal habit to tell ...