Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary And Metamorphic Minerals
Browse sedimentary and metamorphic minerals specimens identified by the Rock Identifier community.
Yellow Jasper (within host rock)
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Serpentinite
Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)
metamorphic
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Yellow/Siltstone variant)
Arenite (SiO2 primarily)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Jasper Conglomerate (Puddingstone)
Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Banded Agate (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Green Jasper
Jasper (variety of Microcrystalline Quartz, SiO2)
sedimentary
Moqui Marble
Iron Oxide Concretion
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
Fossil Shark Tooth (embedded in matrix)
Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Hematite/Goethite-encased Sandstone)
sedimentary
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Hematite / Goethite (Iron Ore)
Iron Oxide (Fe2O3 / FeO(OH))
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Jasper (Multi-color Chert)
Silicon dioxide (SiO2)
sedimentary
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Chert (Jasper/Common Opal mix)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with Chert or Siltstone bands
Sedimentary carbonate rock (CaCO3) often with siliceous impurities
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral