Identify any rockfrom a photo.

Quartz crystal fragment with iron-oxide inclusions

Quartz, SiO₂; inclusions likely limonite/goethite or possibly mica

Clear quartz crystal (likely vein quartz)

Quartz, silicon dioxide (SiO₂), most likely colorless macrocrystalline quartz

Blue-gray layered sedimentary pebble

Likely micaceous shale or slate; exact identification requires testing

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂, with band-forming impurities

Polished selenite (satin spar gypsum), likely carved/tumbled

Gypsum, CaSO₄·2H₂O; varietal identification is uncertain from the image

Quartz-rich feldspathic rock, possibly pegmatite

Granite/pegmatite; mainly quartz (SiO₂) and feldspar

Likely weathered pink granite or feldspathic rock fragment

Granite, approximately quartz–feldspar–mica aggregate; exact identification is uncertain from the image

Fossilized bone fragment, possibly vertebra

Fossil bone (mineralized hydroxyapatite; exact taxon indeterminate)

Tumbled jasper/chert, possibly brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

Fossilized gastropod shell

Fossil Mollusca, class Gastropoda; likely a mineral-replaced or partially silicified shell

Blue agate slice with quartz crystal cavity

Chalcedony (microcrystalline SiO₂) with quartz (SiO₂)

Polished agate geode slice

Banded chalcedony (microcrystalline quartz, SiO₂) with central quartz druse