Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Category
Man Made Rock (Sedimentary Analogue)
Browse man made rock (sedimentary analogue) specimens identified by the Rock Identifier community.
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Chert / Chalcedony Nodule
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Limestone Concretion (Botryoidal/Calcareous Nodules)
Calcium Carbonate Concretion (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Conglomerate with Native Copper
Clastic Sedimentary Rock with Native Copper (Cu)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Weathered quartz-rich rock fragment
Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Calcite
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Shungite (or Black Onyx / Obsidian)
Amorphous Carbon (Shungite) / SiO2 (Onyx/Obsidian)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Flint / Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion
Ironstone (Limonite/Goethite/Hematite mixture)
sedimentary
Chert Nodule (Iron-Stained)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony nodule)
Silicon Dioxide (SiO2)
sedimentary
Tumbled Agate
Silicon Dioxide (SiO2)
mineral
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Druzy Quartz on Matrix (Chert/Limestone)
Silicon Dioxide (SiO2) with Carbonate host rock
sedimentary
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Bumblebee Jasper
Travertine (Calcite/Aragonite) with Realgar, Pyrite, and Volcanic Ash
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral