Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Category
Mineral Or Sedimentary Rock (With Mineral Inclusions)
Browse mineral or sedimentary rock (with mineral inclusions) specimens identified by the Rock Identifier community.
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Sandstone
Arenite (SiO2 dominant)
sedimentary
Quartz (Milky Quartz / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Foliated metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly migmatitic gneiss
metamorphic
Quartzite with inclusions
Quartzite (primarily SiO2)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Limestone with Chert Nodules
Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions
sedimentary
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone Pebbles
Arenite
sedimentary
Red jasper (likely polished/tumbled)
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
mineral
Brecciated jasper with quartz/chalcedony
Jasper (microcrystalline quartz, SiO₂), with chalcedony and iron-oxide matrix
mineral
Sandstone
Arenite
sedimentary
Banded gneiss
Gneiss, likely biotite–quartz–feldspar gneiss
metamorphic
Sandstone (with potential mineral inclusions)
Clastic sedimentary rock (primarily Quartz, SiO2)
sedimentary
Brecciated jasper
Chalcedony–quartz aggregate, predominantly SiO₂, with iron-oxide coloring
mineral
Quartz (Jasper / Chert)
Silicon Dioxide (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Quartz Geode (Amethyst / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Gneiss (rounded cobble)
Quartz–feldspar–mica gneiss; exact mineral proportions cannot be determined from the image
metamorphic
Tumbled Clear Quartz
Silicon Dioxide (SiO2)
mineral
Dendritic Jasper
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
sedimentary
Sandstone (lithic wake/graywacke variety)
Arenite/Greywacke (SiO2 with lithic fragments)
sedimentary
Sandstone (Siltstone or Fine-grained)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other mineral inclusions
mineral
Blue-gray chalcedony (likely common quartz/chert)
Microcrystalline quartz, SiO₂; possibly weathered chert or chalcedony
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Hag Stone
Perforated sedimentary rock (typically flint, chert, or limestone)
sedimentary
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
sedimentary or mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral