All rocks & minerals

Tumbled agate (chalcedony)

Microcrystalline quartz, SiO₂; likely translucent gray-and-white chalcedony with agate-like banding

Polished leopard-skin jasper (likely)

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

Quartz-rich pebble, possibly agate or chalcedony

Microcrystalline quartz (SiO₂), identification uncertain from the image

Yellow-brown chert (possible jasper)

Microcrystalline quartz, SiO₂; iron-oxide-stained chert

Amber (likely rough amber)

Fossilized tree resin; composition varies, commonly rich in polymerized terpenoids

Orange-stained milky quartz

Quartz, SiO₂, with iron-oxide staining (likely hematite/goethite)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Yellow jasper (likely iron-stained chalcedony)

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

Polished yellow-green pebble, possibly serpentine-rich stone

Unidentified fine-grained silicate rock; serpentine minerals (approx. Mg₃Si₂O₅(OH)₄) are a possibility

Tumbled orange carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Tumbled yellow jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Yellow jasper (likely polished/tumbled)

Microcrystalline quartz, SiO₂, colored by iron oxides; identification is visual and not definitive.

Likely rough smoky quartz

Quartz, silicon dioxide (SiO₂)

Polished agate (likely carnelian/white agate)

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

Tumbled milky quartz

Quartz, SiO₂

Orange jasper (likely tumbled or polished)

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

Yellow-orange tumbled stone, possibly calcite

Uncertain from the image; likely calcite (CaCO₃)

Orange carnelian (likely)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Polished carnelian (likely)

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

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide coloring

Polished banded agate

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Polished carnelian (orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Tumbled red jasper

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

Tumbled chalcedony (likely pale agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony colored mainly by iron oxides

Polished agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained orange

Orange chert (likely jasper)

Microcrystalline quartz (SiO₂), iron-oxide stained; jasper is an opaque variety of chert

Polished fire agate

Chalcedony (microcrystalline quartz, SiO₂) with iron-oxide inclusions

Polished carnelian (orange chalcedony)

Carnelian, a variety of microcrystalline quartz: SiO₂

Polished banded agate

Agate, a variety of microcrystalline quartz (SiO₂; chalcedony)

Red jasper (likely)

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

Tumbled amethyst

Amethyst, purple variety of quartz (SiO₂)

Mineral and rock specimen collection

Assorted geological materials, including amethyst, agate, azurite, calcite, feldspar, garnet, jasper, malachite, pyrite, quartz varieties, and others

Orange calcite

Calcite (CaCO₃)

Likely tumbled black tourmaline (schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Amethyst

Quartz, SiO₂; purple variety colored by trace iron and irradiation

Garnet in marble

Likely almandine or pyrope garnet (X₃Y₂(SiO₄)₃) in calcite marble; species cannot be confirmed from the image alone.

Blue sodalite (likely)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Likely blue mineral or tumbled stone

Unidentified; the image is too blurry for reliable identification

Sea glass (likely green bottle glass)

Human-made soda-lime silicate glass; not a natural mineral or geological rock

Dark, fine-grained rock pebble

Possibly basalt (composition cannot be confirmed from the image)