Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
Browse synthetic polymer (synthetic material) specimens identified by the Rock Identifier community.
Learn about Synthetic Polymer (Synthetic Material) in the encyclopedia
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Sandstone Pebbles
Arenite (primarily SiO2 with mineral cement)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Greenstone / Celadonite-bearing Metamorphic Rock
Greenschist / Celadonite / Serpentinitic pebble
metamorphic
Unakite
Metamorphosed Granite (Epidotized Feldspar and Quartz)
metamorphic
Agate (Carnelian / Fire Agate nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Granite / Diorite (Granitoid)
Granitoid rock (composed mainly of Quartz, Feldspar, and Amphibole/Biotite)
igneous
Basalt (Beach Pebble) / Black Chert
Basalt / Microcrystalline Quartz (SiO2)
igneous
Banded Serpentinite (Beach Pebble)
Serpentine-group silicate rock ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe,Al)2O5(OH)4)
metamorphic
Carnelian / Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz-veined Greywacke
Silicon dioxide (SiO2) in Lithic Sandstone
sedimentary
Chert Conglomerate (Potomac Puddle Stone)
Sedimentary Conglomerate with Iron-Oxide matrix
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Limestone (likely weathered)
Limestone (Mainly Calcium Carbonate, CaCO3)
sedimentary
River Cobble (Quartzite or Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Metamorphic Rock (chiefly Silicon Dioxide, SiO2)
metamorphic
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Sandstone
Clastic sedimentary rock (Arenite)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silica-rich Microcrystalline Quartz (SiO2) with various inclusions
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Citrine Quartz / Yellow Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz River Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Banded Siltstone
Siltstone with planar bedding
sedimentary
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Quartz Geode
Crystalline Silica (SiO2)
mineral
Coquina or Fossiliferous Limestone
Fossiliferous Limstone (CaCO3)
sedimentary
Bituminous Coal
Bituminous coal (Lithotype: Durain/Clarain)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Wishing Stone (Basalt or Chert with Quartz Veins)
Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining
igneous or sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral