Rounded quartz-rich pebbles, likely jasper/chert with one iron-stained specimen

Microcrystalline quartz (SiO₂), possibly jasper or chert; exact identification is uncertain from the image

Small water-worn pebbles, mostly dark gray to brown with mottled pale patches and dull-to-waxy luster; one is orange-red, probably iron-oxide-stained quartz or jasper. Quartz hardness is about 7 Mohs, with no obvious cleavage and conchoidal fracture; density is typically 2.55–2.70 g/cm³.