Mineral Within A Sedimentary Rock

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Chert (Black Chert/Flint)

Chert (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Clear Quartz

Silicon Dioxide (SiO2)

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Rough Precious Opal

Hydrated Silica (SiO2·nH2O)

Granite

Felsic Intrusive Igneous Rock (SiO2, Al2O3, K2O, Na2O)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Agate (specifically Moss or Plume Agate nodding toward Agatized Wood)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz (Chalcedony)

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Zinc Ore (Sphalerite in Matrix)

Sphalerite (Zn,Fe)S within a carbonate or silicate host rock

Banded Agate

Agate (Cryptocrystalline Quartz, SiO2)

Aragonite / Calcite Geode

Calcium Carbonate (CaCO3)

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Milky or Druzy Quartz)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Ferruginous Sandstone (with Iron Oxide staining)

Clastic Sedimentary Rock - Quartz Arenite/Wacke

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Howlite (White Buffalo Turquoise)

Howlite (Calcium Borosilicate Hydroxide), Ca2B5SiO9(OH)5

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Sandstone

Arenite (primarily Quartz, SiO2)

Granite Cobble

Phaneritic Plutonic Felsic Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Herkimer Diamond (Quartz)

Silicon Dioxide (SiO2)

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Goethite and Hematite around a Sandstone core)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of Quartz: SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Ferruginous Sandstone

Clastic Sedimentary Rock (Iron-rich)

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based with various mineral cements)