Coquina
Biogenic Limestone (Calcite / CaCO3)
sedimentary
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Basalt River Stone
Basaltic Igneous Rock
igneous
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Blue Quartzite
Quartzite (primarily SiO2) with inclusions like Dumortierite or Crocidolite
metamorphic
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Basalt (River Pebble)
Basalt
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt
igneous
Porphyritic Basalt
Porphyritic Basalt (with plagioclase phenocrysts)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Jade
Jadeite or Nephrite (both are commonly referred to as 'jade'). Jadeite: NaAlSi2O6; Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2.
Mineral
Diorite (Salt and Pepper Rock)
Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)
igneous
Jasper in Rhyolite matrix
Silicon Dioxide (SiO2) with various inclusions in Felsic Igneous matrix
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Basalt
Extrusive mafic igneous rock
igneous
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Quartzite with inclusions
Metamorphic Rock (Mainly SiO2)
metamorphic
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Diabase (Greenstone)
Diabase or Dolerite
igneous
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
mineral
Greenschist
Greenschist (composed of Chlorite, Actinolite, and Epidote)
metamorphic
Glacial Erratic (Sandstone/Quartzite)
Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)
sedimentary or metamorphic
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
igneous
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Tiger's Eye (likely Hawk's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Anthracite Coal
Anthracite (high-rank coal / Carbon)
metamorphic
Ferruginous Quartzite (Red Sandstone/Quartzite)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
metamorphic
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Basalt
Mafic Volcanic Rock (Primarily Plagioclase feldspar and Pyroxene)
Igneous
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Quartz River Cobble
Silicon Dioxide (SiO2)
Mineral (Primary constituent)
Basalt with Porphyritic Texture
Porphyritic Basalt
igneous
Blue Quartzite
Blue Quartzite (Primary mineral: Quartz, SiO2 with magnesio-riebeckite or crocidolite inclusions)
metamorphic
Sandstone
Arenite (primarily composed of SiO2)
sedimentary