Identify any rockfrom a photo.

Milky quartz (rough quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz vein material

Predominantly quartz (SiO₂); exact rock type cannot be confirmed from the photograph

Pink granite (likely weathered granite)

Granite, composed mainly of quartz, feldspar, and mica

Small rounded rock (likely granite or gneiss)

Unidentified coarse-grained silicate rock; likely granitic composition

Polished dark mafic stone, likely basalt or diabase

Basalt/diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine or iron-titanium oxides

Fossilized shell or coral fragment

Indeterminate marine invertebrate fossil; possibly a worn brachiopod, bivalve, or solitary coral

Weathered granite or granitic gneiss

Granite–gneiss, chiefly quartz, feldspar, and biotite/amphibole

Granite (biotite-bearing, possibly pegmatitic granite)

Felsic intrusive igneous rock; chiefly quartz (SiO₂), feldspar, and biotite mica

Quartz-bearing feldspathic rock, possibly pegmatite

Granite/pegmatitic granitic rock; primarily quartz (SiO₂) and feldspar

Vesicular basalt (likely weathered volcanic rock)

Basalt; primarily plagioclase feldspar, pyroxene, and sometimes olivine

Quartz-rich granitic pebble

Granite or granitic gneiss; chiefly quartz (SiO₂), feldspar, and minor mica

Likely green aventurine or serpentine-bearing stone

Indeterminate from image; possibly quartzite with fuchsite mica or serpentinized ultramafic rock