Iron-rich weathered rock, likely limonite/goethite-bearing laterite
Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))
mineral
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Chert Breccia
Brecciated Chert (Sedimentary Rock)
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Granitic Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (with Arkose characteristics)
Clastic sedimentary rock (SiO2 with KAlSi3O8)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone River Cobble
Arenite (SiO2 based)
sedimentary
Likely quartz-rich mineral fragment
Quartz (SiO₂), possibly iron-stained or included quartz
mineral
Likely weathered iron-rich stone
Uncertain; possibly limonite/goethite-bearing rock
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Rose quartz
Quartz (silicon dioxide, SiO₂), pink variety
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amygdaloidal basalt (vesicular basalt)
Basalt, commonly containing amygdales of quartz, chalcedony, calcite, or zeolites
igneous
Sandstone (Feldspathic / Arkose)
Sandstone (SiO2 with variable mineral grains)
sedimentary
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Quartz (Druzy or Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Breccia
Breccia - Clastic sedimentary rock
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary