Sedimentary Or Igneous (Secondary Formation)

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Peacock Ore

Bornite (Cu5FeS4)

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Diamond

Diamond (C)

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

Jasper

Jasper (Silicon Dioxide, SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

Satin Spar (often marketed as Selenite)

Fibrous Gypsum (CaSO4·2H2O)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Sand Dollar Fossil

Echinoidea (Clypeasteroida)

Grey Jasper (Tumbled Quartz variant)

Jasper (Silicon Dioxide, SiO2)

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Pyrite on Limestone

Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix

Druzy Quartz Geode (likely Smokey Quartz variety)

Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Pink/Red variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

Polygenetic Breccia

Clastic Breccia (containing lithic fragments in a fine-grained matrix)

Jasper

Silicon Dioxide (SiO2) - Impure Variety of Chert

Yellow Ocher / Limonite

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

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Granite

Phaneritic Intrusive Igneous Rock (Granite)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Mookaite Jasper

Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)

Sandstone Concretion

Moqui Marble (Iron-oxide concretion)

Chert (Polished River Pebble)

Chert (SiO2)

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Chert with Iron Staining

Microcrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (variable SiO2 composition)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Fancy Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Banded Agate (variety of Chalcedony)

Agate (SiO2)