Synthetic Polymer (Polylactic Acid)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Quartzite with inclusions or weathered surface

Quartzite

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with trace Fe2+)

Black Marble with Quartz Veining

Metamorphosed Limestone (Recrystallized CaCO3)

Malachite

Copper(II) carbonate hydroxide [Cu2CO3(OH)2]

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Quartzite

Metamorphic rock primarily composed of Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

White Marble

Recrystallized Calcite (CaCO3)

Quartzite (specifically an iron-stained or Carnelian-colored variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Rhodochrosite

Manganese carbonate (MnCO3)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Tufa

Calcium carbonate (CaCO3) - Porous Limestone

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Honey Calcite

Calcium Carbonate (CaCO3)

Aragonite (Yellow/Honey Tumble)

Calcium Carbonate (CaCO3)

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartzite

Quartzite (SiO2)

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

Tufa

Calcareous Tufa (Calcium carbonate, CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (primarily SiO2)

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

Sandstone

Arenite (composed primarily of SiO2)

Quartzite River Pebble

Quartzite (primarily SiO2)

Honey Calcite

Calcite (Calcium Carbonate, CaCO3)

Fossiliferous Limestone

Calcite (CaCO3) with Bioclastic inclusions

Limestone

Sedimentary Calcite (CaCO3)

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Quartzite

Quartzite (Primary mineral: SiO2)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Stromatolite (Fossiliferous Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Calcite (Onyx Marble)

Calcium Carbonate (CaCO3)