Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Category
Mineral Within A Sedimentary Rock
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
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Quartz Geode
Silicon Dioxide (SiO2)
mineral
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (potentially Flint or Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossilized Insect in Nodular Matrix
Invertebrata / Insecta fossil in sedimentary concretion
fossil
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Septarian Nodule
Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)
sedimentary
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Gneiss
Gneiss
metamorphic
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Quartz Geode (Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Triceratops Fossil
Triceratops horridus
fossil
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxide Inclusions
mineral
Green Gneiss
Metamorphic Gneiss
metamorphic
Sandstone (Stream-Rolled)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Chert (specifically Pink/Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Veined Limestone (or Quartz-Veined Slate/Shale)
Metamorphosed Sedimentary Rock with Calcite/Quartz Veins
metamorphic
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Jasper (Yellow Jasper)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Brown Chert
Cryptocrystalline Silica (SiO2)
sedimentary
Common Opal / Chert
Hydrated silica (SiO2·nH2O) or Microcrystalline Quartz (SiO2)
mineral