Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz Geode/Cluster

Quartz (SiO2)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Petoskey Stone (Petrified Favosites)

Favosites (extinct colonial coral), CaCO3 with Silica replacement

Milky Quartz

Silicon Dioxide (SiO2)

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Barite Rose (Desert Rose)

Barium Sulfate (BaSO4)

Sandstone

Arenite (primarily SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Yellow Jasper

Silicon Dioxide with Limonite/Goethite inclusions (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 + various cementing minerals)

Gneiss (Cobble)

Gneiss

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Sandstone with Tafoni Weathering

Arenite (SiO2 based)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Gneiss

Gneiss

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Sandstone

Arenite (primarily SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint/Jasper variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Fossilized Horn Coral

Order Rugosa (Rugose Coral)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Sandstone (principally SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)

Septarian Nodule

Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)