Organic Materia (Not A Rock Or Mineral)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Granite Glacial Erratic

Intrusive Phaneritic Felsic Rock (Granite)

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Graphite

Graphite (Carbon, C)

Granite

Granite (Phaneritic igneous rock)

Sandstone

Arenite (primarily SiO2)

Ironstone Concretion (Nutstone)

Ironstone (with High Limonite/Hematite Content)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Shale

Lutaceous Sedimentary Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Sandstone with Quartz Veining

Clastic sedimentary rock (SiO2 dominated)

Sandstone (likely Quartz Sandstone)

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based with mineral cement)

Unakite or Epidosite

Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)

Fossiliferous Limestone with Rugose Coral

Calcium Carbonate (CaCO3) featuring Rugosa (extinct order of solitary and colony corals)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Limonite with Opal infusion

FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Quartz / Quartzite

Silicon Dioxide (SiO2)

River/Stream Pebble

Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Sandstone (River Cobble)

Clastic Sedimentary Rock (primarily Quartz with Feldspar)

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Lapis Lazuli (Raw Ore)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite component)

Basalt with Quartz/Feldspar Vein

Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)