Identify any rockfrom a photo.

Green-and-white marble (likely serpentine-bearing marble)

Calcite- or dolomite-rich marble with green serpentine/chlorite minerals; exact identification requires testing

Serpentine (rough serpentine-rich rock)

Serpentine-group minerals, chiefly antigorite and/or lizardite; composition broadly Mg₃Si₂O₅(OH)₄

Iron-stained quartzite or ironstone

Likely ferruginous quartzite, composed mainly of quartz (SiO₂) with iron oxides such as hematite and goethite

Weathered granite or granitic gneiss pebble

Quartz–feldspar–mica rock; exact identification is uncertain from the image

Iron-stained chert (possibly jasper)

Microcrystalline quartz (SiO₂), colored by iron oxides

Purple fluorite

Fluorite (calcium fluoride, CaF₂)

Weathered chert (flint)

Microcrystalline quartz (SiO₂), also called chalcedony

Purple fluorite in matrix

Fluorite (CaF₂), likely embedded in a carbonate-rich host rock

Milky quartz pebble

Quartz (SiO₂), with iron-oxide staining

Quartz pebble

Quartz, SiO₂; likely a rounded vein-quartz clast

Iron meteorite (likely an etched or weathered display specimen)

Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)

Polished breccia (decorative stone)

Likely carbonate breccia: angular carbonate-rock fragments in a calcite-rich matrix; exact identification requires testing