Chert (Flint)
Silicon Dioxide (SiO2)
Category
Browse mineral on sedimentary rock specimens identified by the Rock Identifier community.
Chert (Flint)
Silicon Dioxide (SiO2)
Conglomerate
Conglomerate (Rock composed predominantly of rounded clasts > 2mm)
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
Limestone
Calcium Carbonate (CaCO3)
Quartz in Matrix (possibly Basalt or Siltstone host)
Silicon Dioxide (SiO2) in Host Rock
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
Microcrystalline Limestone Pebble
Carbonate sedimentary rock (Calcium Carbonate, CaCO3)
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
Limestone
Sedimentary Calcite (CaCO3)
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Ocean Jasper
Spherulitic Chalcedony (SiO2)
Kambaba Jasper (Crocodile Jasper)
Rhyolite containing Fossilized Cyanobacteria (Stromatolite)
Jasper (specifically Bloodstone/Heliotrope or Dark Green Jasper)
Cryptocrystalline Quartz (SiO2) with inclusions
Banded Chert (Agate)
Silicon Dioxide (SiO2)
N/A (Non-Geological Specimen)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Limonite-stained Quartz / Quartzite
Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
Fossilized Coral
Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)
Magnetite / Iron Ore
Magnetite (Fe3O4)
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
Chalk / Sedimentary Limestone
Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with varying mineral impurities
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Septarian Nodule (Dragon Stone)
Septarian concretion (Complex of Calcite, Aragonite, and Limestone/Clay)
Green Calcite
Calcium Carbonate (CaCO3)