Man Made Material, Not A Natural Rock Or Mineral Specimen

Sandstone

Arenite (primarily SiO2)

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Golden Healer Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Basalt with Scoria/Vesicular Texture

Vesicular Basalt (Iron-rich/Oxidized)

Smoky Quartz

SiO2 (Silicon Dioxide)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Megalodon Shark Tooth (Partial Fossil)

Otodus megalodon (fossilized in Calcium Phosphate/Apatite)

Diorite (Spotted or Dalmatian Stone effect)

Diorite (Intermediate Plutonic Rock)

Granite

Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Sandstone

Arenite (composed primarily of SiO2)

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Diorite

Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)

Smoky Quartz

SiO2 (Silicon Dioxide)

Turquoise

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

Smoky Quartz (Chlorite Inclusions)

Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Plutonic Rock)

Quartz (Drusy/Crystalline variety)

Silicon Dioxide (SiO2)

Orange Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Turquoise in Matrix

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

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Clear Quartz crystals on a Matrix base (Geode fragment)

Silicon Dioxide (SiO2)

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)