Identify any rockfrom a photo.

Dark blue polished stone pendant

Indeterminate; possibly sodalite, lapis lazuli, or blue slag/glass-like material

Pegmatitic granite with dark mica/amphibole

Coarse-grained felsic intrusive rock; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Iron-rich sandstone or weathered ironstone

Ferruginous sandstone, commonly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Iron-rich laterite or weathered ironstone

Laterite, likely limonitic goethite–hematite material

Weathered pink granite or granitic rock

Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

Granite

Granite; chiefly quartz, plagioclase and alkali feldspar, with biotite or hornblende

Tumbled jasper or chalcedony pebble

Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining

Likely weathered iron-rich quartz or chert

Microcrystalline quartz (SiO₂), possibly limonite/goethite stained

Specular hematite (likely iron-rich ore)

Hematite, Fe₂O₃; possibly magnetite-bearing

Orange carnelian (likely tumbled chalcedony)

Cryptocrystalline quartz, SiO₂; orange color commonly from iron oxides

Tumbled yellow chalcedony (likely yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper variety