River Rock (likely Quartzite or Chert)
Quartzite (primarily SiO2)
metamorphic
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
Limestone with Calcite Veining
Calcium Carbonate (CaCO3)
sedimentary
Banded Quartzite River Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Chert (Yellow Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Sandstone (Ferruginous/Red Sandstone)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Obsidian / Chert (Arrowhead Artifact)
Obsidian (volcanic glass, SiO2 with impurities)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Iron Meteorite (Campo del Cielo)
Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)
igneous
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Vesicular Basalt (Aqueous Tumbled)
Scoriaceous Basalt
igneous
Agate (Geode nodule fragment)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pink Granite (Water-worn Cobble)
Granite (Alkali-feldspar granite)
igneous
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Crushed Limestone Aggregate
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist
metamorphic
Schist with Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
metamorphic
Citrine Geode
Citrine (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper (Petrified Wood Variety)
Silicon Dioxide (SiO2)
sedimentary