Limestone
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Category
Sedimentary (Man Made Composite)
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
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Shale
Laminated Mudstone
sedimentary
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary
Tumbled gneiss
Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals
metamorphic
Banded gneiss (likely amphibolite-bearing gneiss)
Gneiss; quartz–feldspar–mica/amphibole aggregate
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Quartzite
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral: Fluorapatite)
mineral
Tumbled reddish sandstone pebble
Quartz-rich sandstone, likely ferruginous arkose or quartz arenite
sedimentary
Weathered sandstone or iron-stained sedimentary stone
Quartz-rich sandstone, commonly arkose or lithic sandstone; composition cannot be confirmed visually
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Fossilized Brachiopod
Brachiopoda (Phylum)
fossil
Chert or Flint
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scallop Shell Fossil
Pecten sp.
fossil
Fossil Snail
Gastropoda (fossilized)
fossil
Sandstone Pebbles
Arenite
sedimentary
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Ironstone / Gossan with Quartz Inclusions
Limonite / Goethite rich Sandstone / Gossan
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Chert (and associated Sedimentary rocks)
Microcrystalline Silica (SiO2)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone (River Pebble)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossilized Bryozoan
Phylum Bryozoa
fossil
Pyritic Sandstone
Clastic Sedimentary Rock (Pyrite-bearing Sandstone)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz variant, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chert (often called Flint when found in chalk/limestone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Brown Jasper (Tiger Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary