All rocks & minerals

Polished orange stone, possibly carnelian

Uncertain from the image; carnelian is orange chalcedony, microcrystalline SiO₂

Rounded river pebble, likely dark basalt or andesite

Fine-grained mafic volcanic rock; exact identification is not possible from the photograph alone

Dark, rounded river pebble (likely basalt or andesite)

Unconfirmed fine-grained volcanic rock; basalt is a plausible identification

Polished boulder opal

Opal (hydrated amorphous silica, SiO₂·nH₂O), likely precious opal

Reddish-brown stone, possibly jasper

Likely iron-oxide-stained microcrystalline quartz (SiO₂); exact identification is uncertain from the image

Polished unakite

Unakite: epidote, pink feldspar (orthoclase), and quartz

Rounded river pebbles

Unidentified mixed lithologies; the reddish pebble may be iron-stained sandstone or volcanic rock

Red-brown pebble, possibly iron-stained sandstone

Indeterminate from the image; likely iron-oxide-stained quartz-rich rock

Polished opal

Opal, hydrated amorphous silica (SiO₂·nH₂O)

Tumbled orange-and-white chalcedony (likely carnelian agate)

Microcrystalline quartz, SiO₂; chalcedony colored by iron oxides

Dark tumbled stone, likely black river pebble

Undetermined; possibly basalt or a dark metamorphic rock such as slate

Tumbled orange-yellow quartz pebble

Quartz (SiO₂), likely iron-stained milky quartz

Polished yellow-brown stone, possibly jasper

Undetermined; potentially microcrystalline quartz (SiO₂) jasper

Tumbled yellow-orange stone, likely yellow jasper

Jasper, a microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the photo

Tumbled yellow-orange agate

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Tumbled jasper (likely brecciated or iron-stained jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides

Polished brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide staining

Orange agate (chalcedony), possibly a small tumbled or naturally water-worn piece

Chalcedony, microcrystalline SiO₂; agate is banded chalcedony

Polished orange jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides

Fossil shell fragment

Likely a marine mollusk shell, composed mainly of calcium carbonate (aragonite and/or calcite); exact species is not identifiable from the image.

Small quartz-rich rock fragment

Unidentified quartz-bearing rock; the image is insufficient for a precise identification

Native gold (gold nugget)

Native gold, Au; commonly alloyed with silver and copper

Orange spotted tumbled stone, possibly fossil coral

Unidentified fossilized coral or porous jasper; the image is insufficient for a firm identification

Likely copper-bearing rock (oxidized copper ore)

Unidentified copper minerals, possibly malachite and cuprite; the image is insufficient for a precise identification

Gypsum crystal cluster (selenite)

Gypsum, CaSO₄·2H₂O; likely a radiating selenite crystal formation

Quartz with iron-oxide staining

Quartz (SiO₂) with likely hematite/goethite coating

Amethyst geode cluster

Quartz (SiO₂), purple variety amethyst, with a banded agate/chalcedony center

Polished brecciated jasper

Iron-oxide-rich microcrystalline quartz (SiO₂), with hematite/goethite; likely brecciated jasper

Tumbled red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides

Orange-red tumbled jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Polished bumblebee jasper (trade name)

Bumblebee jasper; a calcite–aragonite–gypsum-rich volcanic fumarole material, often with iron oxides and dark sulfides; not true jasper

Red shale (likely mudstone)

Iron-oxide-stained clay-rich shale; composition typically clay minerals and fine quartz, with hematite providing the red color

Tumbled jasper (likely brecciated or multicolored jasper)

Microcrystalline quartz/chalcedony, SiO₂; jasper is an impure, opaque variety

Tumbled brecciated jasper (likely iron-stained quartz/chalcedony)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact variety cannot be confirmed from the image

Polished banded jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Tumbled serpentine (likely green serpentinite)

Serpentine-group minerals, commonly antigorite, lizardite, or chrysotile; serpentinite is the rock

Tumbled orange-and-white feldspar-rich stone, likely sunstone or orange feldspar

Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈; exact identification is uncertain from the image

Likely serpentine-rich pebble

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Chrysocolla-bearing copper ore

Primarily chrysocolla, a hydrated copper silicate (approx. Cu₂−xAlx(H₂−xSi₂O₅)(OH)₄·nH₂O); exact identification is uncertain from the image.

Likely fire agate

Botryoidal chalcedony (microcrystalline SiO₂) with iron-oxide layers

Tumbled carnelian

Carnelian, an orange variety of chalcedony (microcrystalline quartz, SiO₂)

Polished agate (chalcedony nodule)

Microcrystalline quartz, SiO₂; agate is banded chalcedony, with possible iron-oxide inclusions