Not A Geological Specimen

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Weathered iron-rich rock, possibly laterite or ironstone

Indeterminate ferruginous rock; likely iron-oxide-cemented material (goethite/limonite ± hematite)

Small rough mineral grain, possibly olivine (peridot)

Olivine-group silicate, commonly (Mg,Fe)₂SiO₄; identification is uncertain from the image

Rounded river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone

Smurf Rock (Fictional Interpretation)

Cyanus Anthropomorphicus (Geologic Simulation)

Moqui Marble (Iron Concretion)

Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Likely weathered granite or granitic gneiss

Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the photograph

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

Polished decorative stone spheres

Mixed material; individual spheres may be agate, jasper, quartz, or other ornamental minerals

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert Nodule in Limestone (Flint in Chalk)

SiO2 (Microcrystalline Quartz) in CaCO3 (Calcite)

Greenschist (or Serpentinite with Manganese Dendrites)

Greenschist facies metamorphic rock

Iron-rich sandstone or weathered ironstone pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides such as hematite (Fe₂O₃) and goethite (FeO(OH))

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Iron-rich concretion (probable hematite/limonite nodule)

Goethite–hematite concretion; FeO(OH) and Fe₂O₃, possibly with quartz/clay

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Iron-rich metamorphic rock, likely schist or gneiss

Possibly biotite–chlorite schist or iron-stained gneiss; exact identification requires closer examination

Weathered iron-rich sandstone or ferruginous conglomerate

Quartz-rich sandstone cemented by iron oxides/hydroxides (primarily hematite and goethite)

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

Chert / Flint

Silicon Dioxide (SiO2)

Granite cobblestone paving

Granite, primarily quartz, feldspar, and mica; likely gray granite or granodiorite

Ironstone concretion (likely hematite-rich)

Iron-oxide-cemented sediment, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH))

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)

Diamond cluster ring

Diamond (carbon, C), faceted and set in jewelry

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF)

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Unidentified metallic mineral fragment

Indeterminate; possibly galena, hematite, or a metallic meteorite fragment

Weathered iron-rich sandstone or conglomeratic sedimentary cobble

Ferruginous sandstone, possibly polymictic conglomerate

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides

Dark garnet-bearing metamorphic rock (probable garnet schist/amphibolite)

Garnet schist or garnet amphibolite; chiefly quartz, mica/amphibole, feldspar, and almandine–pyrope garnet

Quartz vein in host rock

Quartz (SiO₂) vein cutting an unidentified, likely metamorphic host rock

Chert / Flint Tool

Cryptocrystalline quartz (SiO2)

Pegmatitic quartz–feldspar rock

Granitic pegmatite, composed mainly of quartz (SiO₂) and feldspar; mica may also be present

Iron-rich sandstone or ferruginous laterite

Ferruginous sandstone/laterite, chiefly quartz (SiO₂) cemented or stained by iron oxides (hematite Fe₂O₃, goethite FeO(OH))

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite over Sandstone)

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)

Likely weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, possibly ferruginous sandstone

Banded mica schist

Mica schist, chiefly muscovite/biotite with quartz and feldspar

Sandstone

Arenite (SiO2 based)