Diorite (possibly Orbicular Diorite or Porphyritic Diorite)
Intermediate Phaneritic Igneous Rock
igneous
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
Learn about Not A Rock (Synthetic Material) in the encyclopedia
View all →
Granite
Phaneritic intrusive igneous rock
igneous
Pink Quartzite
Silica (SiO2) - Metamorphic rock
metamorphic
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Basalt
Basalt (primarily Pyroxene and Plagioclase)
igneous
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Likely vesicular basalt (scoria)
Basaltic scoria; chiefly plagioclase, pyroxene, and olivine with vesicles
igneous
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Porphyritic Basalt or Porphyry
Porphyritic Igneous Rock
igneous
Slate
Slate (Metamorphic Rock)
metamorphic
Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
sedimentary
Serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, talc, and carbonate
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Fossil Coral in Limestone
Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite
fossil
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Jasp-Agate
Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Rounded sandstone pebble
Quartz-rich sandstone; commonly arkose or lithic sandstone
sedimentary
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Basalt (River Pebble)
Aphanitic Mafic Igneous Rock
igneous
Conglomerate
Conglomerate (Sedimentary rock containing rounded clasts)
sedimentary
Sandstone Flagstone
Arenite (SiO2 with various cementing agents)
sedimentary
Likely basalt (possibly a dark beach pebble)
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral
Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
sedimentary
Weathered mica-rich metamorphic rock
Probable biotite schist or mica schist
metamorphic