Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Mineral And Sedimentary
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Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Zebra Jasper
Silicon Dioxide (SiO2) - Macro-crystalline Quartz/Chert with impurities
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Jasper with Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Chert (Septarian or Banded Nodular Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fancy Jasper (Bloodstone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Geode Nodules / Chalcedony Geode
Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartzite Geode or Crystalline Quartz Node
Silicon Dioxide (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Iron-stained Quartz (with Limonite/Hematite)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (FeO(OH) or Fe2O3)
Mineral
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Sandstone with Quartz Veining
Arenite with SiO2 veins
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (Quartz-rich)
Sandstone (SiO2 dominated)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz or Chalcedony, SiO2)
mineral
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Quartz-Veined Mudstone
Argillite or Mudstone with Quartz Veining (SiO2 in Siliciclastic Matrix)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2
mineral
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Bivalve Fossil (Clam)
Class Bivalvia, likely Mercenaria or similar genus
fossil
Cinnabar in Matrix
Cinnabar (Mercury(II) sulfide, HgS)
mineral