Mineral Or Sedimentary Rock (With Mineral Inclusions)

Pyrite and Sunstone

Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)

Sandstone

Arenite (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO₂)

Dendritic Agate

Chalcedony (SiO2) with manganese/iron oxide inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Halite (Rock Salt)

Halite; NaCl (Sodium Chloride)

Limestone (specifically Fossiliferous Limestone)

Calcium Carbonate (CaCO3)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Milky Quartz

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Blue Sapphire

Corundum (Al2O3)

Chert (White/Gray variety)

Chert (SiO2)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Sandstone

Arenite (primarily SiO2)

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Bull Quartz (Milky Quartz)

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Quartzite Pebble

Quartzite (SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Montana Moss Agate

Chalcedony (Silicon Dioxide, SiO2)

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Quartz with Hematite Staining

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions

Granite

Intrusive Phaneritic Felsic Igneous Rock

Red Jasper (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)

Dalmatian Stone (Dalmatian Jasper)

Dalmatian Stone (A variety of Perthite / Aplite)

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Bauxite

Bauxite (Mixture of Hydrous Aluminum Oxides)

Quartzite

Quartzite (SiO2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Granite Cobble

Phaneritic Felsic Igneous Rock (Granite)

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Jasper with Chalcedony

Silicon Dioxide (SiO2)