All rocks & minerals

Petrified wood

Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissue

Likely amber cabochon ring

Amber, fossilized tree resin (organic mineraloid; not a mineral)

Blue-stone and diamond ring

Blue stone is possibly blue sapphire (corundum, Al₂O₃); surrounding stones appear to be diamonds (carbon, C).

Color-change garnet (likely alexandrite-like garnet)

Likely pyrope–spessartine garnet; exact species cannot be confirmed from the image

Garnet-set gold ring

Likely almandine garnet, Fe₃Al₂(SiO₄)₃; the image does not establish the stone’s identity or treatment

Diamond-set gold ring or ring component

Diamond (crystalline carbon, C); gold alloy setting (Au)

Porphyritic volcanic rock (likely rhyolite or andesite)

Porphyritic felsic-to-intermediate volcanic rock; exact identification requires closer examination

Color-change gemstone ring (stone possibly alexandrite or a synthetic imitation)

Undetermined from the image; alexandrite is chrysoberyl, BeAl₂O₄

Likely granite or granitic rock fragment

Granite (inferred; exact identification is uncertain from the blurred image)

Likely granite or granitic gneiss

Granite: coarse-grained felsic intrusive rock, typically quartz, potassium feldspar, plagioclase, and mica; the image alone cannot distinguish it confidently from gneiss.

Likely granite or granitic gneiss

Granite (quartz–feldspar–mica rock); identification is tentative from the photograph

Likely granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Chert (likely flint)

Microcrystalline quartz, SiO₂

Likely banded chert (flint) fragment

Microcrystalline quartz, SiO₂; visual identification is uncertain from the image alone

Iron-stained quartz-rich rock (likely weathered granite or quartzite)

Quartz–feldspar rock with iron-oxide staining; exact rock type cannot be confirmed from the image

Likely quartz-rich rock (quartzite or vein quartz)

Quartzite, composed predominantly of quartz (SiO₂); exact identification is uncertain from the image

Weathered feldspar-rich rock, possibly granite or pegmatite

Likely feldspar-dominant granitic rock; exact identification requires a closer view of its minerals

Red-orange feldspar crystal (likely orthoclase)

Potassium feldspar, KAlSi₃O₈ (likely orthoclase)

Iron-stained quartz-rich pebble

Likely quartz (SiO₂) with iron-oxide/hydroxide coatings; exact rock type cannot be determined from the image alone

Orange-brown rock fragment, likely iron-stained sandstone

Quartz-rich sandstone with iron-oxide staining (tentative visual identification)

Small rounded quartz-rich pebble

Likely quartz (SiO₂), possibly iron-stained or mixed with other minerals

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz vein in host rock

Quartz (SiO₂) with an unidentified host rock, possibly mica-rich metamorphic rock

Milky quartz pebble

Quartz (SiO₂), massive variety

Quartz-rich granite

Granite, composed chiefly of quartz, feldspar, and mica

Iron-oxide-stained rock (likely limonite/goethite-rich material)

Goethite (α-FeO(OH)) and/or limonite, an iron-oxide/hydroxide mixture coating a rock matrix

Biotite-rich mica schist

Mica schist, likely containing biotite and quartz with possible feldspar

Fossiliferous limestone (coquina-like shell limestone)

Calcite-rich bioclastic limestone, chiefly calcium carbonate (CaCO₃)

Iron-stained quartz-rich rock, possibly quartzite

Quartz-rich rock dominated by silicon dioxide (SiO₂), with red iron-oxide staining; exact rock type is uncertain from the image

Iron-stained milky quartz vein

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

Milky quartz vein with iron-oxide staining

Quartz (SiO₂), likely vein quartz stained by hematite/goethite

Reddish sandstone

Quartz-rich sandstone, likely ferruginous sandstone (quartz grains cemented by iron oxides)

Pink potassium feldspar-rich granite pegmatite

Feldspar-dominant granitic pegmatite, chiefly orthoclase or microcline (KAlSi₃O₈), with possible quartz and mica

Black polished stone beads, likely black onyx or agate

Likely chalcedony (microcrystalline quartz, SiO₂); exact material cannot be confirmed from the image

Fossil coral (polished coral fossil)

Likely colonial rugose coral; fossilized calcium carbonate, chiefly calcite (CaCO₃)

Pink granite pebble

Granite, a coarse-grained felsic intrusive igneous rock, typically composed of quartz, potassium feldspar, plagioclase, and mica

Banded chert (likely an iron-stained chert nodule)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining

Milky quartz with iron staining

Quartz (SiO₂), possibly with minor iron-oxide inclusions

Quartz-rich pebble

Likely quartzite or quartz-rich sandstone; exact identification is uncertain from the image

Septarian nodule fragment

Calcite-filled septarian concretion, commonly with a mudstone or limestone matrix

Quartz (Vein Quartz / Chalcedony)

Silicon dioxide (SiO2)

Banded metamorphic rock, likely gneiss

Gneiss (probable; mineral composition cannot be confirmed from the image)