Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Travertine (likely polished limestone)
Calcite-rich carbonate rock; predominantly CaCO₃
sedimentary
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
River Pebbles and Cobbles
Mixed Siliciclastic Sediments (Quartzite, Chert, and Sandstone clasts)
sedimentary
Quartzite (Pink / Peach)
SiO2 (Metamorphosed Quartz Sandstone)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Serpentinite
Serpentinite (Hydrous magnesium iron phyllosilicate)
metamorphic
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Granite (Pink/Alkali Feldspar Granite)
Plutonic Igneous Rock (Granite)
igneous
Granite
Granite (felsic intrusive igneous rock)
igneous
Scoria
Scoria (Vesicular Basaltic Rock)
igneous
Chert (Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Chert Nodules
Chert (SiO2)
sedimentary
Gabbro
Plutonic mafic rock
igneous
Siltstone with Quartz Vein
Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Siltstone
Siltstone (Detrital Sedimentary Rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartzite Pebbles
Crystalline silica rock (SiO2)
metamorphic
Dacite
Dacite (Intermediate volcanic rock)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Granite
Phaneritic Plutonic Igneous Rock
igneous
Epidote in Quartz
Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)
Mineral
Limestone (Weathered Pebble)
Calcium Carbonate (CaCO3) / Limestone
sedimentary
Likely vertebra fossil or bone fragment
Indeterminate fossilized vertebra; mineralized hydroxyapatite, commonly Ca₅(PO₄)₃(OH)
fossil
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Granite
Phaneritic plutonic igneous rock
igneous
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Rock Specimen
Unclassified rock specimen
sedimentary
Red Sandstone
Arenite (ferruginous sandstone)
sedimentary