Limestone (specifically Fossiliferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Category
Synthetic Polymer (Polylactic Acid)
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Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Scoria with Calcite Infills
Vesicular Basalt with secondary Calcification (CaCO3)
igneous
Azurite Geode
Azurite (Cu3(CO3)2(OH)2)
mineral
Fossiliferous Limestone (with Oyster Fossils)
Fossiliferous Calcarenite / Bivalve Mollusk Fossil
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Cobaltian Calcite (Cobaltoan Calcite)
Cobalt-bearing Calcite (Ca,Co)CO3
mineral
Unakite
Epidotized Granite
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Coquina
Biogenic Limestone (Calcitic shells)
sedimentary
Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Orange Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Quartzite (with Iron Staining)
Quartzite (predominantly SiO2)
metamorphic
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Coquina / Shelly Limestone
Coquina (calcium carbonate, CaCO3)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)
igneous
Quartzite (River Cobble)
Metamorphic Quartz-rich Rock
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartzite (River Pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Fossiliferous Limestone with Crinoid stems
Limestone (CaCO3) containing Crinoidea fossils
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Barite
Barium Sulfate (BaSO4)
mineral
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary