Mineral, Specifically A Rock Fragment

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Sandstone (with Iron Oxide)

Arenite with Limonite/Hematite staining

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate (specifically a Thunderegg/Agate Nodule)

Cryptocrystalline Quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Greywacke (River Slikkenstone)

Greywacke (Impure Sandstone)

Buffalo Nickel (Indian Head Nickel)

Cupronickel (75% Copper, 25% Nickel)

Gneiss (specifically Banded Gneiss)

Gneiss

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

Sandstone

Arenite (composed primarily of SiO2)

Red Sandstone (Old Red Sandstone Pebble)

Arenite with iron oxide (Fe2O3) cement

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone

Arenite

Sandstone

Arenite (primarily SiO2 with iron oxide cementation)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Orange Quartz with Hematite inclusions

Quartz (SiO2) with Hematite (Fe2O3) inclusions

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pyrite and Sunstone

Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)

Amazonite

Microcline (K(AlSi3O8))

Ferromanganese Nodule

Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Amethyst (Druze)

Silicon Dioxide (SiO2) with iron impurities

Jasper (specifically Red Jasper or Iron-stained Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Amethyst

Amethyst (SiO2 - Silicon Dioxide with iron impurities)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Sandstone (Quartzose)

Arenite (Formula: SiO2 primary, with various cements)

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide inclusions)

Sandstone (Ferruginous)

Arenite (with Hematite/Limonite cement)

Sandstone

Arenite (primarily SiO2)