Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Nuummite
Nuummite (ortho-amphibole rock)
metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Silica (SiO2)
sedimentary
Sandstone (Ferruginous)
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Granite
Phaneritic Acidic Igneous Rock (Granite)
igneous
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous
Botryoidal Malachite
Malachite - Cu2CO3(OH)2
mineral
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Herkimer Diamond
Quartz (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
igneous
Greenschist
Greenschist facies rock
Metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Granite
Phaneritic plutonic rock (SiO2 typically >69%)
igneous
Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
sedimentary
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartz Sandstone)
Arenite (primarily SiO2)
sedimentary
Concrete / Conglomerate (Man-made)
Artificial Conglomerate (Cementitious Composite)
sedimentary
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock