Black Opal (Triplet)
Hydrated Silica (SiO2·nH2O)
mineral
Category
Sedimentary Or Mineral
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Mineral in the encyclopedia
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Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
River Cobble (likely Siltstone or Sandstone)
Clastic Sedimentary Rock
sedimentary
Gneiss
Gneiss
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Barite Rose on Marcasite
Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
mineral
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone Pebble
Sedimentary Rock (Quartz Arenite)
sedimentary
Zebra Jasper
Silicified sedimentary rock (SiO2) with mineral inclusions
sedimentary
Geode
Quartz / Chalcedony nodule
sedimentary
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Halite
Halite (Sodium Chloride, NaCl)
mineral
Iron-rich concretion or weathered ironstone
Limonite/goethite-rich ironstone; commonly hydrated iron oxides (FeO(OH)·nH₂O)
sedimentary
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary
Polished brown river pebble (likely chert or fine-grained sandstone)
Indeterminate; probable microcrystalline quartz (chert) or quartz-rich sandstone
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone Pebble
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Jasper (or Agate/Jasper mixture)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Limonite Geode / Ironstone Concretion
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Hag Stone
Perforated Sedimentary Rock
sedimentary