Mineral And Sedimentary

Pyrite

Iron Sulfide (FeS2)

Agate

Silicon Dioxide / Cryptocrystalline Quartz (SiO2)

Amethyst and Hematite Bracelet

Amethyst (SiO2) and Hematite (Fe2O3)

Pyrite

Iron Disulfide (FeS2)

Quartz Geode

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Banded Iron Formation

Banded Iron Formation (BIF)

Sedimentary

Sandstone (Red Flagstone)

Clastic sedimentary rock (primarily Quartz - SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Celestine (Celestite)

Strontium sulfate (SrSO4)

Dalmatian Stone (often called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)

igneous

Marble

Metamorphosed Limestone (main mineral: Calcite, CaCO3)

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

igneous

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)

Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)

Conglomerate

Conglomerate (clastic sedimentary rock)

Petrified Wood

Silicified Wood (SiO2 as Quartz/Chert/Chalcedony)

Chert (Jasper variety)

Chert (SiO2)

Shale

Shale (composition varies: primarily clay minerals and quartz)

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Jasper

Jasper (Silicon Dioxide, SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Schist/Phyllite

Metamorphic Schist (Chlorite Schist variety)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Crinoid Stem Columns (Fossil)

Crinoidea (Class); often composed of the mineral Calcite (CaCO3)

Jasper Conglomerate

Jasper Conglomerate (SiO2 matrix with varying mineral inclusions)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Quartz (pebble)

Quartz (SiO₂)

Mineral

Sandstone

Arenite (SiO2 based)

Sedimentary rock (specifically a concretion or possibly a geode)

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.

Celestine (or Celestite) Geode

Strontium Sulfate (SrSO4)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)