Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Polylactic Acid) in the encyclopedia
View all →
Quartzite
Quartzite (predominantly SiO2)
metamorphic
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Malachite
Copper carbonate hydroxide Cu2CO3(OH)2
mineral
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone (Decorative Gravel)
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Cobble
Quartzite (mostly SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granitoid (Quartz-Feldspar dominant rock)
igneous
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Quartzite Pebbler
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 dominant)
sedimentary
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3)
sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
White Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Diamond (Rough)
Diamond (Carbon, C)
Mineral
Ruby
Corundum (mineral species), variety: Ruby (Al2O3 with Cr3+ as the chromophore)
Mineral
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral
Dolomite or Limestone (Carbonate Rock)
CaMg(CO3)2 (Dolomite) or CaCO3 (Limestone / Calcite)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral