Not A Rock (Animated Character)

Fossiliferous shale or mudstone with a brachiopod fossil

Likely a spiriferid brachiopod fossil in dark shale/mudstone; exact species and age require locality and examination

Quartz geode (likely druzy quartz)

Quartz, silicon dioxide (SiO₂)

Celestite Geode

Celestine (Strontium Sulfate, SrSO4)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Carnelian Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Tumbled green serpentine (probable)

Serpentine-group minerals, chiefly antigorite and lizardite; hydrated magnesium silicate, approximately Mg₃Si₂O₅(OH)₄

Opalite (Man-made Glass)

Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)

Blue Celestite (Celestine) Cluster

Strontium sulfate (SrSO4)

Brecciated jasper (likely silicified breccia)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide matrix and lithic fragments

Herkimer Diamond

Quartz (Silicon Dioxide - SiO2)

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Epidosite

Epidosite (composed primarily of Epidote and Quartz)

Jasper (Red Jasper)

Silicon Dioxide (SiO2) with Hematite inclusions

Tumbled serpentine (likely bowenite/antigorite)

Serpentine-group minerals, chiefly antigorite or lizardite; commonly Mg₃Si₂O₅(OH)₄

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Polished ruby-in-fuchsite (tentative)

Fuchsite mica with corundum (ruby), commonly in quartzite or mica schist

Moonstone

Orthoclase / Feldspar (KAlSi3O8)

Limonite and Goethite Iron Ore

Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)

Green aventurine (likely)

Quartz variety, SiO₂, colored commonly by fuchsite mica or chlorite

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Fossil Coral (Rugose)

Rugosa (Order), often preserved in Limestone (CaCO3)

Quartz-rich sandstone (possibly arkosic sandstone)

Clastic sandstone composed mainly of quartz (SiO₂), with feldspar and mica fragments cemented by silica or carbonate

Tumbled sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-gray lapis lazuli or dumortierite

Quartz Druze

Silicon Dioxide (SiO2)

Obsidian

Volcanic glass (SiO2-rich extrusive igneous rock)

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely occurring in altered igneous or metamorphic matrix

Aventurine

Quartz (SiO2) with fuchsite inclusions

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe) impurities

Amethyst Geode (Carved)

Amethyst (Violet Crystalline Quartz - SiO2)

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Translucent agate/chalcedony

Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Green Fluorite

Calcium Fluoride (CaF2)

Ferruginous Sandstone (Ironstone)

Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Polished septarian nodule

Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix

Amazonite

K(AlSi3O8) - Lead-bearing Microcline (Potassium Feldspar)

Polished pink-and-gray stone, likely rhodonite-bearing rock

Rhodonite (MnSiO₃) in a manganese-rich metamorphic matrix; exact identification requires testing

Almandine Garnet

Almandine, Fe3Al2(SiO4)3