Mineral Side Rock

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Small tan mineral or rock fragment (unidentified)

Indeterminate from the image; no diagnostic features are visible

Sandstone

Arenite (SiO2 based)

Yellow Agate (Banded Chalcedony)

Silicon Dioxide (SiO2)

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Sandstone (Banded)

Clastic Sedimentary Rock: Arenite

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

Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals

River Stone (Sedimentary Sandstone/Quartzite)

Arenite/Quartzite transition specimen

Banded Sandstone Peabble

Arenite with iron oxide banding

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Clastic sedimentary rock

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or volcanic shell

Quartz Geode

Silicon Dioxide (SiO2)

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Weathered volcanic rock, likely andesite or basaltic-andesite

Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)

Small pink mineral fragment

Indeterminate; possibly rose quartz or feldspar

Shale

Shale (clastic sedimentary rock)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Quartz Geode

Silicon dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Mixed Rock and Mineral Collection

Various geological specimens

Likely quartz-rich rock fragment

Indeterminate; possibly quartz-bearing granite or quartzite

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Sandstone

Arenite (Sedimentary Rock)

Gray rock (possibly basalt or fine-grained granite)

Undetermined; no diagnostic minerals are visible

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Iron-stained rock fragment, possibly quartz-rich

Unidentified quartz-rich rock with iron-oxide staining (likely hematite/goethite)

Shale

Argillite / Shale

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Unidentified pale mineral or rock surface

Indeterminate from image; possibly a small quartz or feldspar grain

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)