Sedimentary Rock (Possibly Composed Of Various Minerals)

Fine-grained dark igneous rock, possibly basalt

Basalt (tentative; composition cannot be confirmed from the image)

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Iron-rich rock fragment, possibly hematite-rich ironstone

Likely hematite (α-Fe₂O₃) or iron-oxide-cemented rock; exact identification is uncertain from the image

Weathered layered metamorphic rock, likely schist or phyllite

Micaceous quartz–feldspar schist/phyllite; exact identification requires a fresh surface and testing

Fossil-bearing rock, possibly with a fossilized shell or coralline specimen

Indeterminate fossil in sedimentary matrix; precise identification is not possible from the image

Mica-rich schist (likely biotite schist)

Mica schist, composed chiefly of quartz and mica; exact minerals cannot be confirmed from the image

Carnelian and White Quartz Bracelet

Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz

Likely quartz-rich stone, possibly milky quartz

Quartz (silicon dioxide, SiO₂)

Weathered iron-rich rock, possibly ironstone

Ironstone; likely limonite/goethite-rich material, identification provisional from the photo

Iron-rich weathered rock, possibly limonite-bearing sandstone or laterite

Goethite–hematite/limonite assemblage, likely in a ferruginous sandstone or weathered host rock

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Mica-rich schist (likely biotite schist)

Mica schist, composed mainly of biotite and/or muscovite with quartz and feldspar

Agate

Silicon dioxide (SiO2)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Muscovite Schist

Metamorphic rock primarily composed of quartz and muscovite mica

Red Sandstone

Clastic Sedimentary Rock

Marble

Recrystallized Calcite (CaCO3)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Sandstone

Arenite (major component SiO2)

Sandstone

Arenite (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Mixed tumbled rock and mineral collection

Varied specimens, including probable quartz varieties, jasper, agate, fluorite, rose quartz, amethyst, pyrite, calcite, and others

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Fossilized tooth, likely a mammalian tooth fragment

Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth

Sandstone

Clastic Sedimentary Rock

Sandstone Pebble

Quartz Sandstone

Sandstone

Clastic Sedimentary Rock

Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains)

Weathered quartz-rich sandstone or quartzite cobble

Quartz arenite sandstone; possibly weakly metamorphosed quartzite, composed mainly of SiO₂ (quartz)

Sandstone

Sedimentary Clastic Rock

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Landscaping Gravel / River Rock

Polymictic Gravel Aggregates

Mixed Rock Collection

Polylithic Geological Specimen Mix

Chalcedony

Silicon Dioxide (SiO2)

Weathered sandstone

Quartz-rich sandstone (clastic sedimentary rock)

Quartz

Silicon Dioxide (SiO2)

Iron-rich rock, possibly weathered basalt or ironstone

Tentatively ferruginous basalt; exact identification requires testing

Granite Core Sample

Granite