Tektite (Natural Glass)

Polished white quartz-rich pebble

Microcrystalline quartz (SiO₂), likely milky quartz or quartzite

Green Quartz (Prasiolite / Chlorite-Included Quartz Pebble)

Silicon Dioxide (SiO2) with micro-inclusions

Amethyst

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Green Fluorite (Beaded)

Fluorite (Calcium Fluoride, CaF2)

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Banded Agate (Tumbled)

Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Likely tumbled calcite or pale limestone fragment

Calcite (CaCO₃), possibly microcrystalline limestone

Quartzite Pebble

Metamorphic Quartzite

Yellow Quartz / Chalcedony Pebble

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) impurities

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite/iron oxide inclusions

Jasper (Red/Brown)

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Silicon dioxide (SiO2) with impurities

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Quartz Pebble

Silicon Dioxide (SiO2)

Likely weathered quartz or quartz-rich pebble

Quartz, silicon dioxide (SiO₂)

Quartz-rich gravel fragment

Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Amethyst

Amethyst (SiO2)

Orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing chalcedony (carnelian)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Banded Agate (specifically Gobi Eyes or Eye Agate)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with impurities of Iron (Fe3+)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Green fluorite (likely)

Fluorite — calcium fluoride, CaF₂

Weathered, iron-stained quartz-rich pebble (uncertain identification)

Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Likely weathered granite or granitic pegmatite

Granite; mainly quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Dark flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Likely weathered granite or granitic fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica

Amethyst

Quartz (Silicon Dioxide, SiO2)

Dyed Crackle Quartz (Green)

Quenching-treated Quartz (Silicon Dioxide, SiO2)