Sedimentary And Igneous (Mixed)

Gemstone Beads

Various mineral species

Tumbled feldspar-rich stone (likely granite or pegmatite fragment)

Potassium feldspar, chiefly orthoclase or microcline (KAlSi₃O₈), possibly mixed with quartz

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

Polished blue-gray mineral specimen, likely galena-bearing ore

Galena (PbS), possibly mixed with quartz/calcite and secondary copper minerals

Pegmatite

Igneous Pegmatite (felsic intrusive rock)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Likely hematite-rich iron ore

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

Tumbled hematite-rich ironstone

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

Yellow-orange quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), colored by iron impurities or irradiation

Fossiliferous Limestone (Chert/Clay mixed)

Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Polished hematite-rich ironstone

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

Botryoidal hematite (speculative)

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

Limonite

FeO(OH)·nH2O

Limonite Nodule

Limonite (FeO(OH)·n(H2O))

Yellow Calcite

Calcium Carbonate (CaCO3)

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Black Tourmaline (Schorl)

NaFe3Al6(BO3)3Si6O18(OH)4

Porphyritic Igneous Rock / Porphyry

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

Zoisite with Rubellite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende (Anyolite)

Polished brown jasper or brecciated jasper

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

Tumbled iron-rich stone, likely hematite-bearing rock

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

Jasper (brecciated or orbicular jasper)

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

Limonite

FeO(OH)·nH2O

Iron-rich laterite (probable)

Laterite; iron oxides/hydroxides, commonly goethite and hematite mixed with clay minerals

River Cobbles (Basalt, Quartzite, and Sandstone mix)

Fluvial detritus (primarily SiO2, Plagioclase, and Pyroxene mix)

Yellow chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)

Jasper

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Tumbled red jasper and related pebbles

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

Concrete Fragment

Hardened Portland Cement Composite

Weathered rock fragment (likely limestone)

Calcite-rich limestone, composition and identity uncertain from the image

Tumbled pink-and-white quartz

Quartz, silicon dioxide (SiO₂), likely rose quartz mixed with milky quartz

Iron-rich rock, likely hematite/goethite-rich ironstone

Hematite (α-Fe₂O₃), possibly mixed with goethite (FeO(OH)) and gangue minerals

Jasper

Microcrystalline Quartz (SiO2)

Olive Opal

Hydrated amorphous silica (SiO2·nH2O)

Jasper

Microcrystalline Quartz (SiO2)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment