Marble

Chert (Jasper Variant likely)

Silicon Dioxide (SiO2)

Chert (Nodule)

Chert (mainly Microcrystalline or Cryptocrystalline Quartz, SiO2)

Red Chert (Jasper)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Turritella (Gastropod Fossil)

Turritella (Genus of gastropods), CaCO3 (Calcium Carbonate or Silicified Agate)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Amber

Succinite

Greywacke with Quartz Veins

Lithic Sandstone (Greywacke) with SiO2 inclusions

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone Concretion

Septarian or Carbonate-cemented Sandstone Concretion

Diamond (faceted)

Diamond (Pure Carbon, C)

Mookaite Jasper

Silicified Radiolarite (SiO2 with impurities)

Diamond

Diamond (pure carbon, C)

Diamond

Diamond (C)

Limestone

Calcium Carbonate (CaCO3)

Banded Chert (River Siltstone)

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (Hagstone/Adder Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Black Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Emerald and Diamond (Jewelry Setting)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)

Limestone

Calcium Carbonate (CaCO3)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Orange Calcite (often commercially sold as Honey Calcite or Aragonite)

Calcium Carbonate (CaCO3)

Limestone (Brecciated/Recrystallized)

Calcium Carbonate (CaCO3)

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Mookaite (Mookaite Jasper)

Silicified Radiolarite (SiO2 with iron oxides)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Coquina

Coquina (Biogenic Limestone / CaCO3)

Basalt

Mafic Volcanic Rock (primarily Plagioclase and Pyroxene)

Banded Iron Formation (BIF)

Banded Iron Formation (Fe2O3 + SiO2)

Banded Chert in Matrix

Microcrystalline Quartz (SiO2)

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Amber Flint (Chert)

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Diamond (in a jewelry setting)

Cubic Carbon (C)

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)