Rock (Likely Sedimentary)

Banded Iron Formation (BIF) with Quartz

Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)

Quartz

Silicon Dioxide (SiO₂)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

River Cobble (likely Quartzite or Limestone)

SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Fossiliferous Limestone with Brachiopods

Calcium Carbonate (CaCO3) with fossilized Brachiopoda sp. (likely Order Spiriferida or Rhynchonellida)

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

White Quartz

Quartz (SiO2)

Granite Pebble

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Basalt

Basalt (Mafic volcanic rock)

Pebble (likely Quartzite or Chert)

Clastic Sediment, potentially composed of SiO₂ (Quartz)

Granite

Intrusive igneous rock (high SiO2)

Milky Quartz/Clear Quartz Cluster

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert Pebble

Microcrystalline Quartz (SiO2)

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2) crystal conglomerate

Shungite

Non-crystalline carbon (similar to anthracite coal or meta-anthracite)

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Basalt with Vesicular Texture

Basalt (SiO2 range 45-52%)

Yellow Chert (Jasper)

Chalcedony (SiO2) with iron oxide inclusions

Glacial Cobble (likely Granitic or Gneissic)

Granite/Gneiss Glacial Erratic

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Chert (Jasper-like)

SiO2 (Cryptocrystalline Quartz)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Serpentinite (Commonly known as Serpentine)

Antigorite, Lizardite, or Chrysotile [(Mg,Fe)3Si2O5(OH)4]

Red Jasper (Amygdaloidal Basalt with Agate)

Silicon dioxide (SiO2) in Basalt host

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

Pink Anthracite Coal (dyed)

Anthracite Coal (Artificially Colored)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Quartz Druzy on Matrix (likely Agate or Jasper)

Silicon Dioxide (SiO2) with various mineral inclusions