Red jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Category
Mineral, Sediment
Browse mineral, sediment specimens identified by the Rock Identifier community.
Learn about Mineral, Sediment in the encyclopedia
View all →
Petrified Wood
Silicified Wood (SiO2)
mineral
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Polished ammonite fossil
Ammonoidea (likely a Jurassic or Cretaceous ammonite), preserved in limestone/mudstone
fossil
Ironstone concretion
Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)
sedimentary
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Banded Siltstone
Siltstone with rhythmic bedding
sedimentary
Sandstone (Greywacke)
Arenite / Lithic Wacke (SiO2 predominant)
sedimentary
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Petrified Wood
Silicified wood (Quartz, SiO2)
metamorphic
Zebra Jasper (Zebra Stone)
Silicon Dioxide (SiO2) with iron oxide and manganese inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
sedimentary
Quartz nodule (River pebble)
Silicon Dioxide (SiO2)
mineral
Mica-rich metamorphic rock, likely schist
Biotite–muscovite schist, possibly garnet-bearing
metamorphic
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shale
Shale (clay-sized silicate minerals)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Sandstone (Quartzite-leaning)
Arenite (primarily SiO2)
sedimentary
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Limestone with Chert Nodules
Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions
sedimentary
Polished septarian nodule
Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix
sedimentary
Red Sandstone Pebble
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 staining)
sedimentary
Quartz-rich metamorphic rock, likely mica schist
Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar
metamorphic
River Rocks (Polished River Pebbles)
Stream-rounded clastic sediments
Mixed (Sedimentary, Igneous, and Metamorphic)
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Bivalve Fossil (Clam Fossil)
Class Bivalvia (likely Gryphaea or similar Order)
fossil
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Fossilized Shark Tooth (Cretaceous to Neogene)
Elasmobranchii dental fossil (likely Squalicorax or similar species)
mineral (biogenic replacement)
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Layered shale or mudstone fragment
Fissile claystone/mudstone, commonly clay minerals with quartz and minor iron oxides
sedimentary