Synthetic Polymer (Polylactic Acid)

Pink Polished Marble (or Limestone) Pillar

Recrystallized Calcium Carbonate (CaCO3)

Oolitic Chert

Oolitic Microcrystalline Quartz (SiO2)

Orange Quartzite / River Pebble

Silicon Dioxide (SiO2) - Recrystallized Sandstone

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2)

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Quartz (Milk Quartz / Massive Quartz)

Silicon Dioxide (SiO2)

Crushed Limestone Aggregate

Limestone (Calcium Carbonate, CaCO3)

Red Quartzite / Ferruginous Quartz

Quartzite (primarily Silicon Dioxide, SiO2 with Iron Oxide impurities)

Quartzite

Quartzite (SiO2)

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Yellow Chert (River Stone/Pebble)

Chert (Cryptocrystalline Quartz, SiO2)

Aragonite

Aragonite (Calcium Carbonate - CaCO3)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartzite River Stone

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Black River Stone (likely Basalt or Chert)

Basalt (primarily Plagioclase Feldspar and Pyroxene)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Quartzite with Quartz Vein

Metamorphosed Quartz-rich Sandstone (SiO2)

Banded Calcite (often sold as Onyx or Mexican Onyx)

Calcite (Calcium Carbonate, CaCO3)

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (principally SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartzite

Quartzite (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Travertine

Tufa limestone (CaCO3)

Granite

Granite (Felsic Plutonic Rock)

Banded Calcite (Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Limestone

Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)

Banded Calcite (often sold as Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Lapis Lazuli

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

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)