Mineral, Specifically A Detrital Grain

Chert (specifically Red Chert/Jasper nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically Iron-stained River Cobble)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Opal variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Agate (specifically Lake Superior Agate or similar)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)

Microcrystalline Quartz (SiO2)

Chert (specifically River Stone / Jasper variety)

Microcrystalline Quartz (SiO2)

Granite Thin Section

Granitic rock (Phaneritic texture)

Shale

Shale (fine-grained clastic sedimentary rock)

Greenstone (Greenschist)

Greenschist (composed of Chlorite, Epidote, and Actinolite)

Basalt

Basalt (Igneous Volcanic Rock)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Ironstone Concretion

Limonitic/Hematitic Concretion

Sandstone Geode (Ironstone Concretion)

Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Basalt

Mafic Volcanic Rock (composed of Plagioclase Feldspar and Pyroxene)

Yellow Quartzite Pebble

Quartzite (primarily Silicon Dioxide - SiO2)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Basalt

Basalt (Mafic volcanic rock)

Schist

Mica Schist

Basalt

Mafic Igneous Rock

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Sandstone

Arenite (primarily SiO2)

Vesicular Basalt (Lava Rock)

Aphanitic Mafic Igneous Rock

Quartzite

Quartzite (primarily SiO2)

Basalt with Quartz/Calcite Vein

Amygdaloidal Basalt (matrix) with Mineral Vein filling

Greenschist

Greenschist facies metamorphic rock

Graywacke

Graywacke/Lithic Sandstone

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Feldspathic Granite (likely Syenite or Granite Pegmatite)

Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Greenstone

Metabasalt / Chlorite-Epidote Schist

Quartz / Quartzite

Silicon Dioxide (SiO2)

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Granite Gneiss

Gneiss (derived from granitic protolith)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Wonderstone (Sandstone)

Silicified Quartz Sandstone with Iron Oxide staining

Ferruginous Quartz (Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)