Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)
sedimentary
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Chert (or Flint)
SiO2 (predominantly microcrystalline quartz)
Sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Agate Geode
Silicon Dioxide (SiO2)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Not a rock, mineral, or geological specimen
N/A
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Unknown Rock Specimen
igneous
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (specifically a weathered Chert nodule or fragment)
Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a concretionary structure
sedimentary
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary