Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Basalt River Pebble
Extrusive mafic volcanic rock
igneous
Granite Cobble
Granite (Felsic Plutonic Rock)
igneous
Gray Basalt Cobble
Basalt
igneous
Basalt (Weathered Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Small Grains)
Silicon Dioxide (SiO2)
mineral
Quartz Cobble (with Iron Oxide Staining)
Microcrystalline to Macro crystalline Quartz (SiO2)
sedimentary
Quartzite with Hematite staining
Metamorphic Quartzite (SiO2) with Ferruginous Oxides
metamorphic
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
River Cobble (likely Basalt or Greenstone)
Mafic Igneous Rock (with possible chloritic alteration)
igneous
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Blue Agate (Tumbled and Dyed)
Silicon Dioxide (SiO2) with likely organic dyes
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Seashell Fragment (Aragonite/Calcite)
Calcium Carbonate (CaCO3) - Shell fragment
sedimentary
Turquoise
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Chert
Chert (SiO2)
sedimentary
Yellow Quartz (Iron-stained Quartz)
Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities
mineral
Red Sandstone
Arenite with iron oxide (Hematite) cement
sedimentary
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Chalcedony (Agate/Quartz pebble)
Silicon dioxide (SiO2) - Microcrystalline Quartz
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Limonite-stained Gossan/Ironstone
Goethite and Hematite (Fe2O3 • nH2O)
sedimentary
Iron-rich Gossan with Quartz
Limonite and Goethite with Silicon Dioxide (SiO2)
sedimentary
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Chalcedony (Agate)
Quartz (Silicon Dioxide, SiO2)
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary
Banded Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Quartzite / River Cobble
Quartzite (SiO2 with iron oxide impurities)
metamorphic