Flint / Chert Nodule
Silica (Microcrystalline Quartz), SiO2
sedimentary
Category
Mineralogical Specimen
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Chert / Flint (Artifact)
Microcrystalline quartz (SiO2)
sedimentary
Carrara Marble
Recrystallized Calcite (CaCO3)
metamorphic
Chalcedony Geode Fragment
Microcrystalline Quartz (SiO2) within a nodule
sedimentary
Chert / Flint Nodules
Chert (SiO2)
sedimentary
Fossiliferous Limestone (Hash)
Bioclastic Grainstone / Calcarenite
fossil
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Granite Pebble
Felsic Intrusive Igneous Rock
igneous
Sandstone (Banded)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Fossilized Burrow Cast
Microcrystalline Quartz (SiO2) with Trace Carbonates
sedimentary
Granite
Phaneritic plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Basalt Porphyry
Porphyritic Basalt
igneous
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
River Rock (likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Chert (Yellow Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Quartzite River Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Garnet Schist
Almandine Garnet in Mica Schist
metamorphic
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Fossiliferous Limestone (Pink/Red)
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Banded Chert
Silicon dioxide (SiO2)
sedimentary
Granite river rock
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Sandstone (Greywacke/Lithic Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Chalcedony (Agate/Seashell replacement)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Iron Meteorite (Campo del Cielo)
Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)
igneous
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral