Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Fossilized Shark Tooth in Matrix
Otodus sp. (likely Otodus obliquus)
sedimentary
Chert (Jasper/Agate mix)
Microcrystalline Quartz (SiO2)
sedimentary
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Likely weathered metamorphic rock (quartzite or schist)
Quartz-rich foliated metamorphic rock; exact identification requires testing
metamorphic
Weathered metamorphic rock, likely gneiss or schist
Indeterminate foliated silicate rock; commonly quartz–feldspar–mica assemblage
metamorphic
Weathered sandstone or iron-stained siltstone
Quartz-rich clastic sedimentary rock, likely ferruginous sandstone
sedimentary
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing
metamorphic
Quartz-veined Mudstone or Argillite
SiO2 (Quartz) in Siltstone/Mudstone matrix
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Weathered Sandstone Cobble
Arenite / Quartz Sandstone
sedimentary
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Greywacke)
Arenite / Clastic Sedimentary Rock
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Small white mineral fragment
Indeterminate; possibly quartz, calcite, or feldspar
mineral
Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily Quartz)
sedimentary
Fossiliferous Limestone
Autochthonous Biogenic Sedimentary Rock (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Fossiliferous Shale
Sedimentary Clastic Rock with fossil inclusions (likely Brachiopod or Bivalve impressions)
fossil
Fossiliferous Shale
Fossiliferous Mudstone / Shale
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Gneiss (specifically Granitic Gneiss)
Gneissic Metamorphic Rock
metamorphic
Sandstone (Fossiliferous)
Arenite / Clastic Sedimentary Rock
sedimentary
Conglomerate
Clast-supported polymict conglomerate
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
River Pebble (Graywacke/Sandstone)
Lithic Sandstone
sedimentary
Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Sandstone River Pebble
Arenite (SiO2 predominantly)
sedimentary
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary