Unidentifiable Rock Fragment
Uncertain
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Banded Sandstone (Wonderstone)
Sandstone with Liesegang Rings (SiO2 with Iron Oxides)
sedimentary
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Breccia
Breccia
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (with Feldspathic/Arkose qualities)
Arenite (primarily SiO2 with KAlSi3O8 components)
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Ferruginous Sandstone (Ironstone)
Arenite with Limonite/Goethite cement
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Chert (Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
sedimentary
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 based)
sedimentary