Weathered iron-rich concretion or sedimentary rock
Likely ferruginous sandstone or ironstone concretion; exact identification is not possible from the image alone
sedimentary
Category
Mineral Within A Sedimentary Rock
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Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Green Gneiss
Metamorphic Gneiss
metamorphic
Brown Chert
Cryptocrystalline Silica (SiO2)
sedimentary
Yellow Jasper / Chalcedony
Silicon Dioxide (SiO2) with iron inclusions
mineral
Triceratops Fossil
Triceratops horridus
fossil
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz geode
Quartz (SiO₂), lining a geode cavity; likely with minor iron-oxide staining
mineral
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Sandstone Concretion
Sandstone (Sedimentary rock, mostly SiO2)
sedimentary
Ferruginous Quartz (Red Quartz)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/f0e26140-66af-4b29-ac3d-420c184c210e-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Jasper and Quartz Breccia
Silicified Breccia / Microcrystalline Quartz with Iron Oxide
sedimentary
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Agate
Silicon Dioxide (SiO2)
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Limestone with Calcite Veining
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Likely ironstone concretion
Iron-oxide-cemented sedimentary concretion, commonly hematite/goethite-rich
sedimentary
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Ruby in Kyanite
Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion (SiO2 + FeO(OH))
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary