Identify any rockfrom a photo.

Fossilized tooth, likely shark tooth

Fossil selachian tooth; possibly Otodus/Carcharocles or related shark, identification uncertain from image

Likely fossil tooth or tooth fragment

Indeterminate fossilized vertebrate tooth; possibly shark or marine reptile, identification uncertain from the image

Tumbled smoky quartz (probable)

Quartz, silicon dioxide (SiO₂), smoky variety

Granite (likely biotite granite)

Coarse-grained plutonic rock composed chiefly of quartz, potassium feldspar, plagioclase, and biotite mica

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Unakite (likely)

Epidote–orthoclase–quartz rock; composition approximately epidote Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH) plus K-feldspar and quartz

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Rounded granite or granitic gneiss cobble

Granite/granitic gneiss, chiefly quartz, feldspar, and mica

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Quartz-rich pegmatitic rock, likely pink granite or quartzite

Probable pink granite/pegmatite; chiefly quartz (SiO₂), potassium feldspar, and minor mica

Pink granite (likely weathered granite)

Granite; mainly quartz, alkali feldspar, plagioclase, and minor mica

Tumbled orange chalcedony or jasper

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony/jasper