Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock
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Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Chalcedony Geode (Hydrated Silicon Dioxide, SiO2)
sedimentary
Agate
Silicon dioxide (SiO2)
mineral
Carnelian (Red Agate)
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orbicular Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral
River Stone / Pebble
Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)
Mineral, Sediment
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Agate
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Chert Arrowhead (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Druzy Quartz (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Banded Agate (Tumbled)
Agate (Variety of Chalcedony/Quartz), SiO2
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Geode or Concretion
Silica-based Concretion / Quartz Geode
sedimentary
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Carnelian
Carnelian (Silica, SiO2)
mineral
Carnelian
Carnelian (SiO2 - Chalcedony colored by Iron Oxide)
mineral
Red Jasper
Jasper (Silicate mineral - SiO2)
sedimentary
Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
High-grade regional metamorphic rock
metamorphic
Quartz Druzy on Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Ferruginous Chert
Silicon dioxide with iron oxide impurities (SiO2 + Fe2O3)
sedimentary
Limonitic Sandstone with Inclusion
Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Laterite (Iron-rich bauxite or Gossan)
Ferricrete (Fe2O3·nH2O)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite with Hematite cement (SiO2 + Fe2O3)
sedimentary
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary