Sedimentary (Base), Then Artificial

Gravel or Crushed Stone

Fragmented Aggregate Stone

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Jasper with Cinnabar (Dragon Blood Jasper variant)

Silicon Dioxide with Mercury Sulfide (SiO2 + HgS)

Quartzite Pebble (River Rock)

Metamorphic Quartzite (predominantly SiO2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Chert (Fossiliferous)

Chert (Cryptocrystalline Silica/SiO2)

Sandstone

Arenite (Silicon Dioxide, SiO2 based)

Sandstone

Arenite (SiO2 based with quartz grains)

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone (Weathered)

Arenite (primarily SiO2)

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)

Calamites Fossil (Horsetail Stem)

Calamites (Genus), part of the class Equisetopsida

Coquina

Biogenic Limestone (Coquina)

Sandstone Concretion

Clastic Sedimentary Rock - Quartz Arenite / Sandstone

Coquina or Fossilized Shell Fragment

Calcium Carbonate (CaCO3) / Biogenic Limestone

Sandstone

Arenite (predominantly SiO2 quartz grains)

Sandstone Clast

Arenite (primarily SiO2)

Chert (specifically Tan Chert)

Chert (SiO2)

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO₂)

Coquina

Biogenic Limestone (Calcitic shells)

Chert (Iron-stained)

Chert (SiO2 - Silicon Dioxide)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (varieties include Jasper or Flint)

Chert (Microcrystalline Silica, formula: SiO2)

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Chert / Quartz Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Quartzose)

Arenite (primarily SiO2)

Brecciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Sandstone

Arenite (SiO2 primarily)

Mica Schist

Mica Schist (primarily Muscovite and Biotite composition)

Sandstone (Ferruginous)

Sandstone (mainly SiO2 with Fe2O3 staining)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Chert Breccia (with Iron Staining)

Microcrystalline Quartz (SiO2) with iron oxides (Limonite/Goethite)

Sandstone (Cross-bedded Drill Core)

Clastic Sedimentary Rock (primarily SiO2)

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Conglomerate (River Rock)

Clastic sedimentary rock (primarily SiO2)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (Microcrystalline Quartz), SiO2