Sandstone
Sedimentary Clastic Rock
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.
Learn about Sedimentary Rock (Specifically A Concretion Or Possibly A Geode) in the encyclopedia
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Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Crystal (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Blue Celestite (with Galena)
Strontium sulfate (SrSO4) and Lead sulfide (PbS)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Conglomerate
Polymictic Conglomerate
sedimentary
Septarian Nodule
Siderite or Calcite Concretion
sedimentary
Septarian Nodule or Mud Crack Fossil
Septarian Nodule (Concretion)
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Moqui Marble
Iron Oxide Concretion
sedimentary
Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Sandstone
Clastic sedimentary rock (primarily quartz arenite)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
sedimentary
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Moqui Marble (Iron Concretion)
Iron Oxide Concretion (Goethite/Hematite Cemented Sandstone)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Septarian Pebble
Septarian nodule / Concretion
sedimentary
Moqui Marble (Iron Concretion)
Hematite-Goethite Concretion
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Red Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide impurities (Hematite)
sedimentary
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Banded Agate (Orca Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Jasper Conglomerate (Puddingstone)
Jasper Conglomerate (Siliceous Sedimentary Rock)
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Granite
Intrusive Felsic Igneous Rock (composed of Quartz, Potassium Feldspar, Plagioclase Feldspar, and Biotite/Amphibole)
igneous
Puddingstone (specifically Michigan/Gowganda Puddingstone)
Conglomerate (Jasper Conglomerate)
sedimentary
Conglomerate (Quartz Pebble Conglomerate)
Quartz Pebble Conglomerate
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Weathered quartz-rich pebble (tentative)
Likely quartz/chalcedony, SiO₂, possibly iron-stained
mineral