Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Anthropogenic (Man Made Material)
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Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (Agate/Carnelian variety)
Cryptocrystalline Quartz (SiO2)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Chert (often called Flint when dark)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Grey variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Coquina with Shell Fragment
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Granodiorite
Granodiorite
igneous
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Banded Calcite (Mexican Onyx)
Calcite (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rounded gray river pebble, likely fine-grained sandstone or siltstone
Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone or siltstone
sedimentary
Rutilated quartz crystal
Quartz, silicon dioxide (SiO₂), containing rutile inclusions (TiO₂)
mineral
Polished granite pebble
Granite, commonly quartz–feldspar–mica aggregate
igneous
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Polished yellow jasper or opaque chalcedony bead
Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper
mineral
Yellow jasper (likely ocean jasper or brecciated jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral veins
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Lazulite Quartzite
Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)
metamorphic
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Fossiliferous Chert (Brachiopod/Bryozoan Fossil)
Microcrystalline quartz (SiO2) with fossil inclusions
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary