Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Banded Calcite (often sold as Caribbean Calcite or Honey Calcite)

Calcium Carbonate (CaCO3)

Sandstone (likely Quartzose)

Clastic sedimentary rock (SiO2 primary)

Fossil Brachiopod Cast (Atrypa species)

Phylum Brachiopoda, Class Rhynchonellata, Order Atrypida

Sandstone (Ferruginous)

Arenite (Fe2O3 rich)

Chalcedony (Agate/Carnelian type)

Silicon Dioxide (SiO2)

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Yellow Quartz (Chalcedony or Agate)

Silicon Dioxide (SiO2)

Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Fossilized Solitary Rugose Coral (Horn Coral)

Order: Rugosa (e.g., Grewingkia or Heliophyllum); composed of Calcite (CaCO3) or Silica (SiO2)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Sandstone with Calcite Vein

Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Granite (Weathered)

Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)

Rough Emerald/Green Beryl

Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium

Sandstone

Clastic sedimentary rock (primarily SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Pebble)

Arenite (primarily SiO2)

Fossil Coral (Rugosa or Solitary Coral)

Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Chalcedony Nodule (Carnelian/Agate)

Chalcedony (Silicon Dioxide, SiO2)

Sandstone Concretion

Sedimentary concretion

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Rough Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Sandstone

Arenite (SiO2 based with mineral cement)

River Cobble (likely Basalt or Chert)

Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Nodule)

Chert (SiO2)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation

Orange Calcite

Calcium Carbonate (CaCO3)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)