Rock (Likely Sedimentary)

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Banded Flint (Polished Stripe Flint)

Silicon Dioxide (SiO2) - variety of Chert

Kambaba Jasper

Stromatolite (Fossilized Algae)

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Jasper and Yellow Chert (Tumbled)

Microcrystalline Quartz (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz / Common Opal Transition

Silicon Dioxide (SiO2)

Turquoise

Hydrated copper and aluminum phosphate (CuAl6(PO4)4(OH)8·4H2O)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O

Chert (specifically Flint or Jasper variant)

Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Slate

Slate (Foliated Metamorphic Rock)

Fossiliferous Limestone (Coquina / Shell Limestone)

Bioclastic Limestone (CaCO3)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

Quartz

Quartz (SiO₂)

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

Mookaite Jasper

Silicified Radiolarite (Silicon Dioxide: SiO2)

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Yellow Jasper

Silicon Dioxide with Iron inclusions (SiO2)

African Turquoise

Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)

Sandstone (Quartzose Sandstone)

Arenite

River Pebble Gravel

Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)

River Pebble (Quartz-rich)

Silicon Dioxide (SiO2) with various inclusions

Chert (Nodule)

Silicon dioxide (SiO2) - Cryptocrystalline Quartz

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Petrified Wood

Silicified Wood (SiO2)

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Limestone (specifically Dolomitic Limestone)

Calcium Magnesium Carbonate (CaMg(CO3)2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Piddock bored rock (Boring Stone)

Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)