Identify any rockfrom a photo.

Milky quartz

Quartz (silicon dioxide, SiO₂)

White marble (likely calcite marble)

Calcite marble; predominantly calcite (CaCO₃)

Probable fossiliferous limestone with shell or coral fossils

Fossiliferous limestone, chiefly calcite (CaCO₃); exact fossil type is unclear from the image

Likely gypsum (selenite/alabaster)

Gypsum, CaSO₄·2H₂O

Fossiliferous limestone (likely coral or shell-rich limestone)

Calcite-dominated limestone, chiefly calcium carbonate (CaCO₃); exact fossil type is unclear from the image

Diorite (likely)

Diorite, an intrusive intermediate plutonic rock

Iron-stained quartz-rich rock, possibly quartzite

Quartzite (tentative; predominantly quartz, SiO₂)

Vesicular volcanic rock (likely scoria)

Scoria, typically basaltic to andesitic volcanic rock

Green tumbled stone, possibly aventurine

Unidentified green quartz-rich material; aventurine is a variety of quartz (SiO₂)

Clear quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Likely pyrite (“fool’s gold”) fragment

Pyrite, FeS₂

Red jasper (likely tumbled/polished chalcedony)

Jasper, an opaque variety of microcrystalline quartz (SiO₂)