Sandstone (Ferruginous)
Arenite (with iron oxide cement, Fe2O3)
sedimentary
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Oolitic Limestone (Egg Stone)
Oolite (Chemical sedimentary rock, primarily CaCO3)
sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Yellow Quartz (Citrine or Yellow Jasper)
Silicon Dioxide (SiO2)
mineral
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Sandstone (with potential iron-oxide staining)
Arenite (primarily SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Gneiss
Gneiss
metamorphic
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)
igneous
Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
mineral
Chalcedony Nodule (Agate/Chert)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Siltstone with flute casts or scratch marks
Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)
sedimentary
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
Sandstone
Arenite
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
metamorphic
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary