Agate
Agate (Silicon Dioxide, SiO2)
mineral
Category
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Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Basalt Porphyry
Porphyritic Basalt
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Basalt with Quartz Veining
Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)
igneous
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Granite
Intrusive Felsic Igneous Rock
igneous
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Note regarding image quality
Indeterminate
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Red)
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Asphalt Concrete
Bituminous conglomerate
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary