Mineral, Specifically A Detrital Grain

Magnetite

Magnetite (Fe3O4)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Agate (specifically Chalcedony/Banded Agate)

Silicon Dioxide (SiO2)

Porphyry (specifically Porphyritic Rhyolite or Andesite)

Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)

Ferruginous Sandstone

Sandstone with iron oxide (Hematite/Limonite) cement

Petrified Wood

Silicified Wood (SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Quartz

Silicon Dioxide (SiO₂)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Greenschist

Greenschist (Chlorite-actinolite schist)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Pink Granite

Granite (Phaneritic Quartz-Feldspar Rock)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Pink Granite

Phaneritic intrusive igneous rock (Felsic)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Carnelian

Carnelian (SiO2)

Zircon

Zircon (ZrSiO4)

Pink Granite

Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Sandstone (with ripple marks)

Arenite / Quartz Sandstone

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Conglomerate

Conglomerate (clastic sedimentary rock)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Green Sandstone

Glauconitic Sandstone

Mahogany Obsidian Arrowhead

Volcanic Glass with Hematite/Magnetite inclusions (Amorphous Silicon Dioxide)

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

Pink Granite

Granite (Felsic Plutonic Rock)

Pink Granite

Granite (Alkali-feldspar granite)

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)