Mixed: Igneous And Sedimentary

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

Crushed stone aggregate

Mixed lithic aggregate; individual fragments cannot be identified from the image

Dyed Agate

Silicon Dioxide (Chalcedony with artificial colorant), SiO2

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

Tumbled hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-bearing silicates

Likely hematite-rich iron ore

Hematite, Fe₂O₃, possibly mixed with magnetite or other iron oxides

Pyrite

Iron Pyrite (FeS2)

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Botryoidal hematite (speculative)

Hematite, iron(III) oxide (Fe₂O₃), possibly mixed with goethite or magnetite

Black Tourmaline (Schorl)

NaFe3Al6(BO3)3Si6O18(OH)4

Fossiliferous Limestone (Chert/Clay mixed)

Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Polished hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-rich jasper

Polished golden mineral specimen, likely golden calcite or citrine quartz

Identification uncertain from the photograph; possibilities include calcite (CaCO₃) or quartz (SiO₂), with the color potentially enhanced by polishing or coating

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with Iron Oxide / Chlorite inclusions

Red Agate

Chalcedony (SiO2)

Auriferous Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Likely smoky quartz or quartz-rich tumbled fragment

Quartz, silicon dioxide (SiO₂), possibly smoky quartz

Polished brown jasper or brecciated jasper

Microcrystalline quartz (SiO₂), commonly mixed with iron oxides and other silicates

Porphyritic Igneous Rock / Porphyry

Porphyry (Plagioclase/Quartz phenocrysts in a finer-grained groundmass)

Tumbled iron-rich stone, likely hematite-bearing rock

Hematite (Fe₂O₃), possibly mixed with magnetite/goethite and host rock

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Quartz (clear quartz/crystal quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Quartz-rich rock, possibly milky quartz

Quartz (SiO₂); the photo may show a quartz-rich rock, but its texture is not clear enough to determine a specific rock name.

Pyrite

Iron Sulfide (FeS2)

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Tumbled red jasper and related pebbles

Jasper, a microcrystalline variety of quartz (SiO₂), commonly containing hematite/goethite and other iron oxides

Dark metallic-looking mineral specimen, possibly magnetite

Magnetite (Fe₃O₄), tentative identification

Jasper (brecciated or orbicular jasper)

Microcrystalline quartz (SiO₂), commonly mixed with hematite, goethite, chlorite, and other silicates

Small quartz fragment (probable)

Quartz, SiO₂

Agate

Silicon Dioxide (Chalcedony), SiO2

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)