Banded Calcite (often sold as Caribbean Calcite or Pink Calcite)
Calcium Carbonate (CaCO3)
mineral
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Chalk
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebbles
Meta-quartzite (SiO2)
metamorphic
Limestone Pebble with Crinoid Fossil
Calcium Carbonate (CaCO3) - Fossiliferous Limestone
sedimentary
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide/Hematite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3)
sedimentary
Chert (varieties include Jasper or Flint)
Chert (Microcrystalline Silica, formula: SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (variously known as Flint or River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Mainly SiO2 and Al2O3)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limestone with Secondary Mineralization
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Fossiliferous Limestone (CaCO3)
sedimentary
Shale
Mudstone/Shale
sedimentary
Limestone Pebble
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Limestone (likely Tufa or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone with Calcite Veining
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral