Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Category
Browse mineral on sedimentary rock specimens identified by the Rock Identifier community.
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Chert with Desert Varnish
Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
Limestone
Calcium Carbonate (CaCO3)
Sandstone Pebble (Quartzite-rich)
Clastic Terrigenous Sedimentary Rock (SiO2 dominant)
Pyrite
Iron Disulfide (FeS2)
Fossiliferous Shale or Slate with Plant Fossils
Fossil-bearing argillaceous rock
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Jasper (Yellow/Brown variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Basalt (Amygdaloidal)
Amygdaloidal Basalt
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3)
N/A (Non-Geological Object)
Slate with Red Sandstone Landscaping Rock
Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Quartz Pebble
Silicon Dioxide (SiO2)
Banded Gneiss
Gneiss (variable mineral composition)
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
River Stone (Chalcedony/Jasper variety)
Microcrystalline Quartz (SiO2)
Black Opal
Hydrated silica (SiO2·nH2O)
Mookaite Jasper
Silicon Dioxide (SiO2) - Radiolarite
Chert (Nodular)
Microcrystalline Silica (SiO2)
Chert (Nodule)
Silicon Dioxide (SiO2)
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Chert (varietal: Flint Pitted Pebble)
Cryptocrystalline Quartz (SiO2)
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
Banded Iron Formation
Banded Iron Formation (BIF)
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Calcite (Banded Calcite / Onyx Marble)
Calcium Carbonate (CaCO3)
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)