Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Category
Browse sedimentary (jasper), mineral (aquamarine) specimens identified by the Rock Identifier community.
Chert (variations include Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (often called Flint or Jasper)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
Pyrite
Iron Sulfide (FeS2)
Sandstone
Arenite (SiO2 primarily)
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Chert (often called Jasper or River Rock)
Chert (SiO2)
Chert (often called Jasper or River Siltstone)
Microcrystalline Quartz (SiO2)
Chert (often called Flint or Jasper based on color)
Microcrystalline Silica (SiO2)
Jasper Quarzite (possibly Lake Superior Agate mix)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Conglomerate
Conglomerate (a clastic sedimentary rock)
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Limonite / Ironstone Nodule
Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O
Orange Calcite (likely polished specimen)
Calcite
Carnelian
Carnelian (Silicon Dioxide, SiO2)
Shale
Lutaceous sedimentary rock
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
Orange Calcite
Calcium Carbonate (CaCO3)
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
Manganese Ore (Psilomelane/Pyrolusite)
Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)
Pyrite in Shale
Iron Disulfide (FeS2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
Limonite
Limonite (Hydrous iron oxides, predominantly Goethite FeO(OH)·nH2O)
Ferruginous Sandstone
Arenite with Iron-Oxide cement (Fe2O3 · nH2O)
Chert (specifically Yellow or Brown Chert / Jasper)
Silicon Dioxide (SiO2)
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Quartz Mineral
Silicon Dioxide (SiO2)
Banded Iron Formation (BIF)
Banded Iron Formation
Limonite (Ironstone Concretion)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
Silty Shale
Silty Shale (Fissile Sedimentary Rock)