Chert (specifically Tan/Brown Chert)
Chert (SiO2)
sedimentary
Category
Sedimentary (Chemical)
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Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Andesite Porphyry
Andesite Porphyry
Igneous
Chert (Hag Stone / Hole Stone)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite (River Cobble)
Quartzite (primarily SiO2)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Quartz (Carnelian-tinted Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Quartz (Sunstone-like Chalcedony)
Silicon Dioxide (SiO2)
mineral
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Rock Salt / Halite Crust
Halite (Sodium Chloride, NaCl)
sedimentary
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Chert Pebble with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion
sedimentary
Chert (often called Flint when dark or found in chalk)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint nodule)
Silicon dioxide (SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Granite (phaneritic background) with Limestone/Calcite carving
Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)
igneous and sedimentary
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Chert / Flint Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained River Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (Native Carbon, C)
metamorphic
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
mineral
Marcasite Concretion (Propeller/Sand Dollar shape)
Marcasite (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Micrite/Chalky variety)
Calcium Carbonate (CaCO3)
sedimentary