Identify any rockfrom a photo.

Likely tumbled yellow-green gemstone, possibly prehnite

Unconfirmed; prehnite is a hydrous calcium aluminum silicate, Ca₂Al(AlSi₃O₁₀)(OH)₂

Rhodonite

Rhodonite, (Mn,Fe,Mg,Ca)SiO₃

Tumbled quartz with iron-oxide inclusions

Quartz (SiO₂), with likely hematite/goethite staining and host-rock inclusions

Tumbled quartz-rich rock, possibly milky quartz with iron staining and inclusions

Quartz (SiO₂), likely with iron-oxide staining and minor inclusions; exact rock type cannot be determined from the image alone

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Weathered river pebble, likely quartzite

Quartzite (predominantly interlocking quartz, SiO₂); identification is tentative from the photo

Small rounded pebble (rock type indeterminate)

Unidentified fine-grained lithic pebble

Dark green-black tumbled stone, possibly nephrite jade

Undetermined; possible nephrite (tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Likely quartzite pebble

Quartz-rich quartzite, composed mainly of SiO₂

Small dark mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for a reliable identification.

Unidentified small green-brown mineral fragment

Indeterminate from the photograph; possibly olivine, but identification is uncertain

Tumbled citrine (likely)

Quartz, SiO₂; yellow-orange color may be natural citrine or heat-treated amethyst