Quartz geode or drusy quartz cluster
Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity
mineral
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Weathered quartz-rich rock, possibly granite or granitic pegmatite
Indeterminate quartz–feldspar aggregate; likely granite/pegmatite
igneous
Weathered granitic rock
Granite, likely biotite granodiorite
igneous
Garnet-bearing gneiss
Quartz–feldspar–mica gneiss with iron-rich garnet (commonly almandine)
metamorphic
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Greenschist
Greenschist facies rock (containing chlorite, actinolite, albite, and epidote)
metamorphic
Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia
Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining
igneous
Chert / Flint (Flaked Stone Tool / Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Siltstone
Clastic Sedimentary Rock with Fossil Inclusions
sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Basalt
Basalt (Mafic volcanic rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Quartz-Mica Schist (with Muscovite)
Metamorphic Rock (Quartz, Muscovite, Feldspar)
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Limestone with Calcite Veins
Calcium Carbonate (CaCO3) - Sparry Limestone
sedimentary
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Red Sandstone (Old Red Sandstone)
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Chert (or Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (likely Order Spiriferida or Orthida)
fossil
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Gneiss
Gneiss
metamorphic