Not A Geological Specimen

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

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

Smurf Rock (Fictional Interpretation)

Cyanus Anthropomorphicus (Geologic Simulation)

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

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

Man-made Crystal (Lead Glass)

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

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Chert / Flint Tool

Cryptocrystalline quartz (SiO2)

Vesicular basalt pebble

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and commonly olivine

Unidentified metallic mineral fragment

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

Iron-stained sandstone or weathered ironstone

Quartz-rich sandstone with iron-oxide cement, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH))

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)

Raw dark metamorphic rock, likely schist or slate

Mica schist or phyllite; commonly quartz–mica–chlorite aggregate

Polished garnet-bearing gneiss

Biotite-quartz-feldspar gneiss with almandine garnet (garnet: Fe₃Al₂(SiO₄)₃)

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

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)

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

Limonite/goethite-rich material; composition commonly FeO(OH)·nH₂O with clay and quartz impurities

Banded metamorphic rock, likely mica schist or gneiss

Mica schist/gneiss, chiefly quartz, feldspar, biotite and muscovite

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)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartz-rich pegmatite fragment

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible biotite or tourmaline

Ferruginous Sandstone (Ironstone)

Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))

Hematite / Red Ochre (Iron Ore)

Hematite (Fe2O3)

Biotite Schist

Biotite-rich Schist

Basalt with Peridotite (Olivine) Xenolith

Olivine-rich Peridotite (Dunite) xenolith in Vesicular Basalt; chemical formula (Mg,Fe)2SiO4

Basalt cobble in glacial till or gravel

Basalt, a fine-grained mafic volcanic rock; likely an altered basalt clast

Weathered granite cobble

Granite (quartz–feldspar–mica rock; commonly containing quartz, K-feldspar, plagioclase, and biotite)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Iron-rich banded iron formation fragment (likely hematite/magnetite ore)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (SiO₂)

Vesicular volcanic rock (likely pumice or scoria)

Pumice/scoria; predominantly volcanic glass and feldspar-rich silicate material

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Moqui Marble (Ironstone Concretion)

Goethite-Hematite Sandstone Concretion

Weathered iron-rich sandstone or siltstone

Clastic siliciclastic sedimentary rock, likely ferruginous sandstone/siltstone (quartz-rich, Fe-oxide cement)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Rounded iron-rich cobble (likely lateritic sandstone or ironstone)

Ferruginous sandstone/ironstone; chiefly quartz (SiO₂) with iron oxides, especially hematite (Fe₂O₃) and goethite (FeO(OH))

Iron-rich sandstone or weathered laterite

Ferruginous sandstone; chiefly quartz (SiO₂) cemented by iron oxides/hydroxides

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

Laterite/limonite mixture; primarily hydrated iron oxides such as goethite (FeO(OH)) and iron-rich clay minerals

Inukshuk Rock Sculpture (composed of Granite, Slate, and Amethyst)

Silicon Dioxide (Amethyst portion, SiO2) with mixed silicate rock assemblage