Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Category
Mineral Side Rock
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Sandstone with Quartz Veining
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Geode (Unopened)
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Basalt Porphyry
Porphyritic Basalt
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Sandstone
Arenite
sedimentary
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Geode (Unopened)
SiO2 (Quartz-filled Sedimentary Nodule)
sedimentary
Basalt with Quartz Veining
Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Shale (possibly Carbonaceous or Oil Shale)
Laminated Mudstone (primarily clay minerals and quartz)
sedimentary
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Note regarding image quality
Indeterminate
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous