Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.

Limestone (with Calcite Veining) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (with Calcite Veining)

Calcium Carbonate (CaCO3)

Amethyst (Amethyst (Silicon Dioxide - SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide - SiO2)

Rough Corundum (likely Sapphire/Zircon-bearing) (Aluminium Oxide (Al2O3)) — mineral

Rough Corundum (likely Sapphire/Zircon-bearing)

Aluminium Oxide (Al2O3)

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Milky Quartz Pebble (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Amazonite (Amazonite (KAlSi3O8, a variety of Microcline)) — mineral

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Chert (Black Flint) (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert (Black Flint)

Chert (Microcrystalline Quartz, SiO2)

Granite (weathered) (Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite (weathered)

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Basalt with Quartz Veins (Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions) — igneous

Basalt with Quartz Veins

Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Tektite (Indochinite) (Tektite (impactite), primarily high-silica glass (SiO2)) — igneous

Tektite (Indochinite)

Tektite (impactite), primarily high-silica glass (SiO2)

Red Scoria (Lava Rock) (Vesicular Basalt / Scoria) — igneous

Red Scoria (Lava Rock)

Vesicular Basalt / Scoria

Chert (Jasper/Quartzite river pebble) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Jasper/Quartzite river pebble)

Microcrystalline Silica (SiO2)

Sandstone (with Manganese staining) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (with Manganese staining)

Arenite (composed primarily of SiO2)

Chert Pebble (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ocean Jasper (Orbicular Jasper (Silicon Dioxide, SiO2)) — mineral

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Red Scoria (Lava Rock) (Scoria (Extrusive Igneous Rock / Mafic composition)) — igneous

Red Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock / Mafic composition)

Quartz (specifically Milky/Gray Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

River Pebble (Quartz/Jasper) (Silicon Dioxide (SiO2)) — sedimentary

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Bivalve Fossil (Shell Fragment) (Class Bivalvia (Calcium Carbonate - CaCO3)) — sedimentary

Bivalve Fossil (Shell Fragment)

Class Bivalvia (Calcium Carbonate - CaCO3)

Basalt with Iron Oxidation (Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)) — igneous

Basalt with Iron Oxidation

Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)

Travertine (Calcareous Tufa) (Calcium Carbonate (CaCO3)) — sedimentary

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

Dalmatian Stone (Dalmatian Jasper (Aplitic Rock)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Green glass sphere/marble (Soda-lime glass (primarily SiO2, Na2O, CaO)) — Man-made object (Simulant)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Man-made object (Simulant)

Limestone (Calcareous sedimentary rock (CaCO3)) — sedimentary

Limestone

Calcareous sedimentary rock (CaCO3)

Limestone Pebble (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Limestone (Calcite (CaCO3)) — sedimentary

Limestone

Calcite (CaCO3)

Limestone (Ocherous) (Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)) — sedimentary

Limestone (Ocherous)

Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Quartzose) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone (Calcareous Sandstone) (Calcareous Sandstone (primarily SiO2 with CaCO3 cement)) — sedimentary

Sandstone (Calcareous Sandstone)

Calcareous Sandstone (primarily SiO2 with CaCO3 cement)

Granite Cobble / Rounded Granite River Rock (Granite) — Igneous

Granite Cobble / Rounded Granite River Rock

Granite

Basalt (River Pebble) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (River Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Vesicular Basalt (Scoria) (Mafic extrusive igneous rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Vesicular Basalt (Scoria)

Mafic extrusive igneous rock (primarily Plagioclase Feldspar and Pyroxene)

Tektite (Indochinite) (Tektite (High-silica natural glass, primarily SiO2 with Al2O3)) — igneous

Tektite (Indochinite)

Tektite (High-silica natural glass, primarily SiO2 with Al2O3)

Scoria (Vesicular Basalt / Scoria (Mafic silicate rock)) — Igneous

Scoria

Vesicular Basalt / Scoria (Mafic silicate rock)

Apache Tear (Obsidian) (Volcanic glass (SiO2 - Silicon Dioxide)) — igneous

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

Granitic Pegmatite with Schorl (Granitic Pegmatite (NaAlSi3O8, KAlSi3O8, SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — igneous

Granitic Pegmatite with Schorl

Granitic Pegmatite (NaAlSi3O8, KAlSi3O8, SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)