Antropogenic (Man Made Industrial Byproduct)

Botryoidal Chalcedony

Chalcedony (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcite (CaCO3)

Amethyst

Quartz (SiO2) with trace iron impurities

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

Queen Conch Shell (Biogenic Calcium Carbonate)

Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)

Chalk

Carbonate rock (mainly CaCO3)

Pyrite

Pyrite (FeS2)

Chert (Flint)

Silicon Dioxide (SiO2)

Pearl

Organic gemstone (Calcium carbonate - CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)

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Sandstone

Arenite

Quartz (in matrix)

Quartz (SiO₂)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

N/A (Non-Geological Object)

Sandstone

Arenite (variable SiO2 composition)

Sandstone

Arenite (primarily SiO2)

Bismuth

Bismuth (Bi)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Basalt

Basalt (Mafic volcanic rock)

Pearl

Calcium Carbonate (CaCO3) with Conchiolin

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Scoria

Scoria (a vesicular basalt or andesite)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Sapphire (likely blue synthetic sapphire or blue glass in a ring)

Corundum (Al₂O₃), specifically the blue variety due to trace amounts of iron and titanium impurities. If synthetic, it would still be Al₂O₃.

Pearl

Aragonite (CaCO3 with conchiolin)

Quartz with Mica (Micaceous Quartz)

Silicon Dioxide (SiO2) with Phyllosilicates

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Nacre (Mother of Pearl)

Nacre (Biogenic Aragonite/Calcite composite, CaCO3)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)