Sedimentary Rock (Specifically A Type Of Travertine)

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities

Travertine (Tufa)

Terrestrial Sedimentary Limestone (CaCO3)

Travertine (Tufa)

Calcium Carbonate (CaCO3)

Kambaba Jasper

Stromatolite (Fossilized Algae)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Travertine

Terrestrial Sedimentary Rock (Calcium Carbonate, CaCO3)

White Onyx (Marble Onyx)

Calcite (CaCO3) - Banded Calcium Carbonate

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Chert

Silicon dioxide (SiO2)

Travertine (used in construction, not a 'specimen' in situ)

Travertine

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

Chert

Silicon dioxide (SiO2)

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Travertine

Calcareous Tufa / Travertine (CaCO3)

Travertine

Calcareous Tufa (CaCO3)

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Limestone (specifically Chalky Limestone)

Calcium Carbonate (CaCO3 / Calcite)

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Limestone (specifically Iron-stained or Argillaceous Limestone)

Calcium Carbonate (CaCO3) with Iron Oxide (Fe2O3) impurities

Limestone (specifically Tufa or Travertine)

Calcium Carbonate (CaCO3)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

African Turquoise

Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Sandstone (Graywacke)

Clastic Sedimentary Rock (Lithic Sandstone)

Limestone

Calcium Carbonate (CaCO3)

Banded Calcite or Travertine

Calcium Carbonate (CaCO3)

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Sandstone

Arenite (primarily SiO2 with iron oxide cementation)

Basalt

Basalt (composition: Plagioclase, Pyroxene, and Olivine)