Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Limestone

Calcium Carbonate (CaCO3)

Ironstone Nodule (Ironstone Concretion)

Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite

Dendritic Agate (also known as Dendritic Siltstone or Mudstone)

Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)

River Pebble (Basalt/Greywacke)

Weathered Basalt or Fine-Grained Greywacke

River Pebble (Likely Quartzite or Chert)

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Jasper

Jasper (Silicon Dioxide, SiO2)

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Jasper

Jasper (Silicon Dioxide, SiO2)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Fossilized Megalodon Tooth Fragment

Otodus megalodon (Carcharocles megalodon fossil)

Gneiss

Gneiss

River Pebble (Greywacke or Basaltic)

Massive Greywacke or Basaltic Andesite

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Green Schist

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Turquoise

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

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Biotite Mica

K(Mg,Fe)3AlSi3O10(OH)2

Green Jasper

Jasper (Silicon Dioxide, SiO2)

Pumice

Vesicular volcanic glass (primarily SiO2)

Celestite (Celestine) Geode

Strontium Sulfate (SrSO4)

Granite

Phaneritic Plutonic Felsic Rock

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Jasper (Cream/Yellow variety)

Silicon Dioxide (SiO2) with impurities

Jasper (Yellow/Brown variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Coquina

Biogenic Limestone

Wishing Stone with Quartz Veins

Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)

Weathered Quartzite or Chert Pebble

Silicon Dioxide (SiO2)

Ironstone Concretion (Moqui Marble)

Ironstone concretion (Fe2O3 with a sandstone core)

River Cobbles (Basalt, Quartzite, and Sandstone mix)

Fluvial detritus (primarily SiO2, Plagioclase, and Pyroxene mix)

Yellow Quartzite (River Stone)

Quartzite (primarily SiO2)

Greisen

Greisen

Diorite

Intermediate plutonic igneous rock

Chert (Mudstone)

Microcrystalline Quartz (SiO2)