Identify any rockfrom a photo.

Small tumbled quartz pebble

Quartz, SiO₂

Small polished translucent stone, possibly chalcedony or quartz

Undetermined; likely microcrystalline silica (SiO₂), such as chalcedony

Polished orange-and-white agate slice

Banded chalcedony, microcrystalline quartz (SiO₂)

Likely fossilized tooth fragment

Indeterminate vertebrate tooth; species cannot be identified from the image

Tumbled sea glass or pale-green quartz pebble

Indeterminate from image; possibly quartz (SiO₂), but the smooth translucent piece may be man-made glass

Tumbled rose quartz

Quartz (SiO₂), pink variety

Fossiliferous limestone

Bioclastic limestone, composed chiefly of calcite (CaCO₃) and fossil fragments

Reddish granite (likely weathered granite)

Granite, a quartz–feldspar–mica plutonic rock

Fossil-bearing sedimentary rock, likely with a fossil shell or ammonite cross-section

Fossiliferous limestone or calcareous mudstone; fossil identity is uncertain from the image

Fossil-bearing limestone with a probable fossil shell

Fossiliferous limestone; the visible fossil may be a gastropod or other shelly fossil, but the image is not diagnostic enough for species identification.

Rounded metamorphic rock (likely gneiss or schist)

Foliated quartz–feldspar–mica rock; precise identification requires closer examination

Fossiliferous limestone

Bioclastic limestone, predominantly calcite (CaCO₃)