Quartz Geode
Silicon Dioxide (SiO2)
mineral
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.
Learn about Sedimentary Rock (Specifically A Concretion Or Possibly A Geode) in the encyclopedia
View all →
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Quartz Geode/Vug in Host Rock
SiO2 (Silicon Dioxide) in various host rocks
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Geode (Chert/Quartz)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Celestite (Blue Celestine)
Celestine (Strontium Sulfate, SrSO4)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
White tumbled stone, likely quartz or calcite
Indeterminate; possibly quartz (SiO₂) or calcite (CaCO₃)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in sedimentary host rock
sedimentary
Puddingstone (Quartzite Conglomerate with Jasper inclusions)
Metaconglomerate (Silicon Dioxide, SiO2)
sedimentary
Blue Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Sedimentary Vug
sedimentary
Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
sedimentary
Chalcedony Geode Part (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
mineral
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Dark gray fine-grained rock fragment
Likely basalt (possibly andesite); exact identification is limited by the photograph
igneous
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Mineral structure/Rock
Weathered iron-rich concretion or laterite fragment
Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix
sedimentary