Sedimentary Rock

Gneiss

Gneiss (High-grade Metamorphic Rock)

Limonite (Iron Ore)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

White Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Yellow Jasper

Cryptocrystalline quartz (SiO2) with iron inclusions

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Yellow Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (Goehite/Limonite) inclusions

Jasper

Chert (Silica: SiO2)

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Gneiss with Quartz Veining

Gneiss (High-grade regional metamorphic rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Leopard Skin Jasper

Orbicular Rhyolite (Silicon Dioxide with various impurities)

Coquina

Coquina (Bioclastic Limestone)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Chert Pebble (with Quartz Vein)

Chert (Cryptocrystalline Silica - SiO2)

Gneiss

Gneiss

Gneiss

Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Common Opal/Chalcedony mixture)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

River Quartzite / Tumble-Polished Quartz

Quartzite (SiO2)

Turquoise

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

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone

Arenite (primarily Quartz, SiO2)

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Fossil Coral

Scleractinia (Anthos), primarily Calcium Carbonate (CaCO3)