Sedimentary Rock (Metamorphosed)

Favosites Fossil (Honeycomb Coral)

Favosites sp. (Extinct genus of tabulate coral)

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Rock Salt (Halite)

Halite (Sodium Chloride, NaCl)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded Chert or Chert with Quartz Veins

Chert (SiO2)

Rough Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Orange Quartzite (Tumbled)

Quartzite (SiO2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Quartzite Pebble (River Rock)

Metamorphic Quartzite (predominantly SiO2)

Chert

Chert (microcrystalline quartz, SiO2)

Bumblebee Jasper

Calcite with Arsenic and Manganese oxides (technically a volcanic rock)

Granitic Gneiss

Gneiss (High-grade regional metamorphic rock)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2)

Red Jasper (specifically Brecciated Jasper)

Silicon Dioxide (SiO2) with Hematite inclusions

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Sandstone with Liesegang Rings

Arenite with Iron Oxide Liesegang Banding

Chert (varietal Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Caliche (with Lichen Cover)

Calcium carbonate-cemented soil layer (CaCO3)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (containing Flint and Calcareous inclusions)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Coquina

Coquina (a type of limestone)

Chert (Yellow/Brown variety)

Chert (SiO2)

Limestone

Calcium carbonate ( преимущественно CaCO3)

Chert (Field Stone)

Chert (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)