Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Chert / Jasper
Silicon Dioxide (SiO₂)
Hematite Nodule
Hematite (Fe2O3)
Gneiss
Gneiss (High-grade metamorphic rock)
Calcite with iron staining
Calcium Carbonate (CaCO3)
Chert
Microcrystalline Silicon Dioxide (SiO2)
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (specifically Flint)
Silicon dioxide (SiO2)
Banded Iron Formation (BIF) / Jasper
Banded Iron Formation (SiO2 with Fe2O3 and Fe3O4)
Limestone with Chert or Siltstone bands
Sedimentary carbonate rock (CaCO3) often with siliceous impurities
Chert / Flint
Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Flint nodules in limestone)
Silicon Dioxide (SiO2)
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
Chert (Jasper)
Chert / Microcrystalline Quartz (SiO2)
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
Chert Pebble
Microcrystalline or cryptocrystalline Quartz (SiO2)
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert / Flint
Silicon Dioxide (SiO2)
Chert (Nodule)
Chert (primarily Microcrystalline Quartz - SiO2)
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Chert (Flint)
Silicon dioxide (SiO2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Chert Nodules / Flint
Crystalline Silica (SiO2)
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Turquoise
Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
Magnetite (Small Granule)
Magnetite (Fe3O4)
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium Carbonate (primarily CaCO3 as Calcite or Aragonite)
Limestone with Calcite Crystals
Calcium Carbonate (CaCO3)