Sedimentary Rock (Possibly Composed Of Various Minerals)

Quartz Pebble

Silicon Dioxide (SiO2)

Vesicular Basalt with Lichen

Vesicular Basalt

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Jasper

Jasper (Silicon Dioxide, SiO2)

Libyan Desert Glass

Tektite (high-silica impact glass), SiO2

Scoria (with Iron Oxidation)

Vesicular Basalt / Scoria

Greenschist (containing Epidote and Quartz)

Greenschist (Epidote-Chlorite-Actinolite Schist)

Sandstone Pebble with Iron Staining

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)

Red Sandstone

Arenite (primarily Quartz SiO₂ with Hematite Fe₂O₃ staining)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Diorite (Dalmatian Stone)

Phaneritic Plutonic Diorite

Lepidolite Bracelet

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2) often in Quartz matrix

Dyed Agate

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Dalmatian Jasper

Peralkaline rhyolite

Agate

Silicon Dioxide (SiO2)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Dyed Blue Agate

Silicon Dioxide (SiO2)

Sandstone Beach Pebble

Clastic sedimentary rock (SiO2 with iron oxide cement)

Petrified Wood

Silicified wood (Quartz, Chalcedony, or Opal)

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Blue Lace Agate (Banded Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Blue Calcite

Calcium Carbonate (CaCO3)

Glauconitic Sandstone (Greensand)

Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Oolitic Chert

Silicon Dioxide (SiO2) with Oolitic texture

Limonite/Hematite Ironstone

Goethite-rich Ironstone (FeO(OH) · nH2O)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-bearing Clastic Sedimentary Rock)

Ferruginous Sandstone

Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone Concretion

Sandstone (Sedimentary Rock) with silica or calcite cement