Sedimentary Rock (Altered)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Sandstone

Arenite (predominantly SiO2)

Jasper and Quartz conglomerate (River Rock)

Silicon Dioxide (SiO2) - Chalcedony and Quartz variety

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Chert (Nodule)

Chert (composition: SiO2)

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Fe2O3 / FeO(OH) mixed with SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Dendrite (Manganese Oxide Dendrites)

Psilomelane or Pyrolusite on Matrix (typically MnO2)

Turquoise in Matrix

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

Granite Gneiss with Garnet

Garnetiferous Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Yellow Ochre / Limonite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Greywacke with Quartz Vein

Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)

Red Sandstone

Arenite (with Iron Oxide)

Sandstone (Picture Sandstone)

Sandstone (primarily Quartz with Iron Oxide impurities)

Ammonite Fossil in Limestone Matrix

Ammonoidea (subclass) in Calcium Carbonate (CaCO3)

Chalk

Calcium Carbonate (CaCO3)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Pyrite in Shale

Iron Sulfide (FeS2) in Sedimentary Matrix

Graphite Schist

C (Carbonaceous Schist)

Sandstone (Ferruginous Concretion)

Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement

Coquina

Bioclastic Limestone

Jasper

Silicon dioxide (SiO2)

Chert (specifically Agate/Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Red Jasper (SiO2 with Fe2O3 impurities)

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Quartz Geode

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Banded Agate (with Quartz Geode Center)

Silicon Dioxide (SiO2)