Quartz (Milky/Common)
Silicon Dioxide (SiO2)
Category
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
Chert (Jasper)
Silicon Dioxide (SiO2)
Quartz (Grain/Pebble)
Silicon Dioxide (SiO2)
Sandstone River Cobble
Arenite (SiO2 based)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (SiO2 based typically)
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Ferruginous Sandstone
Arenite with Iron Oxide cement (Fe2O3 / FeO(OH))
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Quartz (Chert/Chunky Chalcedony)
Silicon Dioxide (SiO2)
Fluorite
Calcium Fluoride (CaF2)
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
Conglomerate
Conglomerate (clastic sedimentary rock)
Sandstone
Arenite (composed primarily of SiO2)
Sandstone
Arenite (primarily SiO2)
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
Quartz (Smoky/Rock Crystal)
Silicon Dioxide (SiO2)
Chert nodules
Microcrystalline Quartz (SiO2)
Chalcedony (Botryoidal/Chalcedony Rose)
Silicon Dioxide (SiO2)
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
Sandstone (Quartz-rich Cobble)
Arenite
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Turquoise
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
Rhodochrosite
Manganese Carbonate (MnCO3)
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Hematite
Iron(III) oxide (Fe2O3)
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
Septarian Nodule
Septarian Concretion (CaCO3, CaMg(CO3)2, SiO2)
Sandstone Pebble
Arenite (specifically Lithic or Quartz Arenite)
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
Sandstone
Arenite
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
Hematite
Iron(III) oxide (Fe2O3)
Fluorite
Calcium Fluoride (CaF2)
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)