Calcite
Calcium Carbonate (CaCO3)
Category
Browse sedimentary (or mineraloid) specimens identified by the Rock Identifier community.
Calcite
Calcium Carbonate (CaCO3)
Quartzite Sandstone / Quartz Sandstone
Quartz Sandstone (SiO2 with minor mineral impurities)
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
Shale with Trace Fossils
Fissile mudrock (Shale)
Shale
Shale (clastic sedimentary rock)
Sandstone
Arenite
Shale
Shale (Lutite)
Shale
Fissile mudstone (rich in clay minerals and quartz)
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
Weathered quartz-rich sandstone
Quartz arenite to feldspathic sandstone, primarily SiO₂ with minor feldspar, mica, and iron oxides
Chert
Silicon dioxide (SiO2)
Sandstone
Arenite (primarily SiO2)
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
Orange Calcite
Calcium Carbonate (CaCO3)
Yellow Calcite
Calcium Carbonate (CaCO3)
Quartz (Chert / Agate / Chalcedony)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Quartz, Sandstone, and Siltstone specimens
Silicon Dioxide (SiO2) and Clastic Sedimentary Rocks
Shale
Sedimentary pelitic rock
Sandstone
Arenite
Fossil in Shale
Fossiliferous Shale
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
Jasper
Microcrystalline Quartz (SiO2)
Quartz
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Pyrite
Iron Sulfide (FeS2)
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
Banded Jasper (Mookaite / Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Weathered sandstone (probable arkosic sandstone)
Clastic sandstone, mainly quartz (SiO₂) with feldspar and iron-oxide cement
Rounded brown pebble, likely weathered sandstone or iron-stained quartzite
Probable quartz-rich sandstone (SiO₂-dominated); exact identification requires testing
Conglomerate
Conglomerate (Sedimentary Rock)
Sandstone Pebble
Sandstone (primarily SiO2)