Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Ironstone Concretion (Moqui Marble type)

Iron oxide concretion (Goethite/Hematite and Sandstone)

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Bumblebee Jasper

Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)

Geode (Unopened)

Silica-lined Vug (primarily SiO2)

Quartz Geode in Sedimentary Matrix

Silicon Dioxide (SiO2) within a limestone/dolostone host

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (Ferruginous Concretion)

Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Vesicular Basalt (Scoria)

Mafic extrusive igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron oxide impurities

Quartz Geode (partially opened)

Silicon Dioxide (SiO2) with iron staining

Blue Chalcedony

Silicon Dioxide (SiO2)

Chert

Silicon dioxide (SiO2)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca

Botryoidal Hematite (Iron Stone Conglomerate)

Hematite (Fe2O3) in sedimentary matrix

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety