Limestone

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Emerald / Green Beryl

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chalk

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Quartzite (with possible Calcite/Limestone weathering)

Quartzite (primarily SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (primarily SiO2)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

White Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Sodalite

Sodalite: Na8(Al6Si6O24)Cl2

Calcite

Calcium Carbonate (CaCO3)

Chert (and Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Chert / Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Chert (Flint variety)

Chert (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Chert (specifically Flint or Common Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (White-Tan variety)

Silicon dioxide (SiO2) / Microcrystalline Quartz

Belemnite Fossil

Belemnitida (Order of extinct cephalopods)

Fossilized Brachiopod

Phylum Brachiopoda (General mineral composition: Calcite/CaCO₃ or Silica/SiO₂)

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Chert (Tan/Brown variety)

Chert (Silicon Dioxide, SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)