Identify any rockfrom a photo.

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Weathered basalt cobble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine and iron oxides

Tumbled yellow-orange calcite

Calcite (CaCO₃), likely honey or orange calcite

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled agate (likely moss or brecciated agate)

Microcrystalline quartz, mainly chalcedony (SiO₂), with iron-oxide inclusions

Tumbled quartz-rich stone (likely milky quartz/quartzite)

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled pale-yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Pale yellow tumbled stone, possibly calcite or quartz

Uncertain; likely calcite (CaCO₃) or pale chalcedony/quartz (SiO₂)

Fossilized bivalve shell fragment

Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite