Identify any rockfrom a photo.

Weathered vesicular volcanic rock, likely pumiceous andesite or rhyolite

Pumiceous intermediate-to-felsic volcanic rock; commonly composed of plagioclase, quartz, alkali feldspar, and volcanic glass, with possible iron-oxide staining

Blue-gray chalcedony (banded agate fragment)

Chalcedony, microcrystalline quartz (SiO₂), likely agate variety

Chrysocolla-bearing copper ore, possibly malachite

Chrysocolla: hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; green bands may be malachite, Cu₂CO₃(OH)₂

Banded agate

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide inclusions

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides; possibly brecciated jasper

Tumbled pale feldspar-rich stone (likely granite or quartzite fragment)

Indeterminate; possible quartz–feldspar aggregate, commonly granite or feldspathic quartzite

Quartz-rich rock fragment, possibly milky quartz or quartzite

Quartz (SiO₂), or quartzite if the grains are fused

Polished agate or jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-bearing

Orange chert or jasper fragment

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing jasper

Green aventurine (likely)

Quartz aggregate with fuchsite mica; SiO₂

Carnelian (orange chalcedony)

Microcrystalline quartz, SiO₂ (chalcedony variety)

Orange chalcedony / carnelian

Microcrystalline quartz (SiO₂), likely iron-colored chalcedony (carnelian)