Sedimentary Or Igneous (Host Environment)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Pyrite (Fools Gold)

Iron Sulfide (FeS2)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Agate (specifically a small Chalcedony nodule)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Gneiss (specifically a water-worn pebble)

Gneiss

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Gneiss

High-grade metamorphic rock (Gneiss)

Banded Agate (Chert/Chaldcedony)

Silicon Dioxide (SiO₂)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Gneiss

Gneiss

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz / Common Agate

Silicon Dioxide (SiO2)

Quartz / Quartz Geode fragment

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Crinoid Stalk in Limestone

Crinoid fossil in Biomicrite (Limestone)

Chert (varietal known as Jasper or Flint)

Silicon Dioxide (SiO2)

Shale

Fissile mudstone (Shale)

Orange Calcite

Calcium Carbonate (CaCO3)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Calcite

Calcite (CaCO3)

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Fe2O3 cement)

Vesicular Basalt with Epidote/Amygdaloidal Basalt

Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

Chert

Chert (Microcrystalline Quartz)

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Chalcedony (Botryoidal or Agate nodule)

Silicon Dioxide (SiO2)

Quartzite Cobble

Quartzite (SiO2)

Milky Quartz

Quartz (SiO2)

Greasy Quartz (likely carved Milky Quartz or Aventurine)

Silicon Dioxide (SiO2)

Green Fluorite in Host Rock

Fluorite (Calcium Fluoride, CaF2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz Fragment

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)