Generic Pebble / Small Rock Fragment
Lithic fragment / Weathered rock particle
sedimentary
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
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Iron-Stained Quartz (Quartzite / Chert)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Atlantic Calico Scallop (Biogenic Aragonite/Calcite)
Argopecten gibbus (Chemical: CaCO3)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
River Rock
Polished Quartzite / Silicified Sedimentary Rock
sedimentary
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Iron-rich concretion (probable limonite/goethite concretion)
Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))
sedimentary
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Fossil Shell
Phylum Mollusca (Gastropod fossil)
fossil
Pyrite-bearing metamorphic rock (probable schist or quartzite)
Quartz–mica schist with disseminated pyrite; approximate composition SiO₂ + phyllosilicates + FeS₂
metamorphic
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
fossil
Fossil Shark Tooth
Chondrichthyes (class)
fossil
Fossilized Gastropod Shell
Gastropoda (Fossilized internal mold or shell body)
fossil
Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Ironstone Concretion (Siderite Nodules)
Siderite (FeCO3) in Mudstone or Sandstone matrix
sedimentary
Ironstone Concretion
Ferruginous Sandstone / Iron-rich Sedimentary Rock
sedimentary
Greenschist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Metallic sulfide ore fragment, possibly pyrite-bearing rock
Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix
mineral
Coarse-grained mica-bearing metamorphic rock, likely schist
Mica schist, probably muscovite–biotite schist with quartz and feldspar
metamorphic
Graywacke
Graywacke Sandstone
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement)
fossil
Fossil Shark Tooth
Selachii fossil
fossil
Kyanite
Kyanite (Al2SiO5)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral impurities
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Tumbled brown stone, likely jasper or chert
Microcrystalline quartz (SiO₂), probably iron-stained jasper/chert
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Likely tumbled quartz-rich pebble
Quartz (SiO₂), possibly a weathered quartzite or chalcedony pebble
mineral
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Fossilized Echinoid
Echinoidea (likely of the order Echinoidea)
fossil
Banded chert or jasper pebble
Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay impurities
sedimentary
Banded iron formation (ironstone), likely hematite–magnetite-rich
Banded iron formation (BIF); chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and quartz (SiO₂)
metamorphic
Dinosaur Bone (Fossilized)
Permineralized Bone (CaCO3 or SiO2 after Hydroxylapatite)
sedimentary
Fossilized Shark Tooth
Lamniformes (order) fossil
fossil
Garnet
Garnet group (X3Y2(SiO4)3)
mineral