Chalcedony with Druzy Quartz Geode rock specimen

Chalcedony with Druzy Quartz Geode

Silicon Dioxide (SiO2)

mineral

Dendritic Agate / Moss Agate rock specimen

Dendritic Agate / Moss Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

mineral

Agate (Chalcedony) rock specimen

Agate (Chalcedony)

Silicon Dioxide (SiO2)

mineral

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Obsidian rock specimen

Obsidian

Volcanic glass (SiO2 + impurities)

igneous

Marble rock specimen

Marble

Recrystallized Calcite (CaCO3)

metamorphic

Quartz Druzy (on Matrix) rock specimen

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

mineral

Agate (specifically a Thunderegg/Agate Nodule) rock specimen

Agate (specifically a Thunderegg/Agate Nodule)

Cryptocrystalline Quartz (SiO2)

mineral

Petrified Wood rock specimen

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Rose Quartz rock specimen

Rose Quartz

Silicon Dioxide (SiO2)

mineral

Horn Coral Fossil rock specimen

Horn Coral Fossil

Rugosa (extinct order of solitary corals)

sedimentary

Smoky Quartz Cluster rock specimen

Smoky Quartz Cluster

Silicon Dioxide (SiO2)

mineral

Agate rock specimen

Agate

Silicon Dioxide (SiO2) - Chalcedony variety

mineral

Chert (Blue-Gray Chert) rock specimen

Chert (Blue-Gray Chert)

Microcrystalline quartz (SiO2)

sedimentary

Chert (specifically Flint or Jasper variant) rock specimen

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

sedimentary

Petrified Wood rock specimen

Petrified Wood

Silicified Wood (primarily SiO2)

sedimentary

Jasper (specifically Chert/Ironstone) rock specimen

Jasper (specifically Chert/Ironstone)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

sedimentary

Snowflake Obsidian rock specimen

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

igneous

Chert (Common Opal/Jasper variety) rock specimen

Chert (Common Opal/Jasper variety)

Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (often called Flint) rock specimen

Chert (often called Flint)

Silicon Dioxide (SiO2)

sedimentary

Basalt rock specimen

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Red Jasper rock specimen

Red Jasper

Silicon Dioxide (SiO2)

sedimentary

Wonderstone rock specimen

Wonderstone

Rhyolite (Silicon Dioxide with Iron Oxide impurities)

igneous

Banded Sandstone (Quartzite-rich) rock specimen

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

sedimentary

Chert (Jasper/Black Chert) rock specimen

Chert (Jasper/Black Chert)

Silicon Dioxide (SiO2)

sedimentary

Chert (Jasper) rock specimen

Chert (Jasper)

Chert / Microcrystalline Quartz (SiO2)

sedimentary

Yellow Jasper rock specimen

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities

sedimentary

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Chert (Jasper/Chalcedony variety) rock specimen

Chert (Jasper/Chalcedony variety)

Microcrystalline Quartz (SiO2)

sedimentary

Sandstone (likely Greywacke or Siltstone variety) rock specimen

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

sedimentary

Pyrite rock specimen

Pyrite

Iron Sulfide (FeS2)

mineral

Basalt (Beach Pebble) rock specimen

Basalt (Beach Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

Igneous

Orbicular Jasper (Eye Jasper / Kambaba-like pattern) rock specimen

Orbicular Jasper (Eye Jasper / Kambaba-like pattern)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Pegmatite (with smoky quartz and tourmaline/biotite) rock specimen

Pegmatite (with smoky quartz and tourmaline/biotite)

Pegmatitic Granite

igneous

Obsidian rock specimen

Obsidian

Obsidian (Volcanic Glass)

igneous

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Granitoid (Granite/Diorite) rock specimen

Granitoid (Granite/Diorite)

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica/Amphiboles)

igneous

Quartzite River Rock rock specimen

Quartzite River Rock

Quartzite (primarily SiO2)

metamorphic

Chalcedony (Desert Rose or Botryoidal Chalcedony) rock specimen

Chalcedony (Desert Rose or Botryoidal Chalcedony)

Silicon Dioxide (SiO2)

mineral

Banded Chert (Jasper) rock specimen

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

sedimentary

Sandstone (Ferruginous) rock specimen

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

sedimentary

Chert (Fossiliferous) rock specimen

Chert (Fossiliferous)

Silicon Dioxide (SiO2)

sedimentary