Granite
Felsic intrusive igneous rock
igneous
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
Browse metamorphic rock (specifically a rock composed of minerals) specimens identified by the Rock Identifier community.
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Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Marble (White)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Moonstone
Orthoclase (KAlSi3O8) or Oligoclase with adularescence
gemstone
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2) with trace minerals
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Crazy Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Polished Jasper / Gneiss (Metamorphic/Siliceous Egg)
Siliceous Gneiss / Banded Metamorphic Rock
metamorphic
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
metamorphic
Pink Granite
Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)
igneous
Polished pegmatitic granite (likely graphic granite)
Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende
igneous
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Weathered Sandstone or Siltstone
Sedimentary Rock
sedimentary
Likely slate fragments
Slate, a fine-grained metamorphic rock composed chiefly of quartz, mica, and chlorite
metamorphic
Unakite Epidote Granite
Unakite (Rock composed of Orthoclase, Epidote, and Quartz)
metamorphic
Brown Antique Granite
Anorthosite (Technically a plutonic rock composed mainly of plagioclase feldspar)
igneous
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Fossil Coral
Hexagonaria or Rugose Coral (Fossilized Calcium Carbonate / Silica)
fossil
Granite
Intrusive Igneous Rock
igneous
Tumbled brecciated jasper (likely ocean or mahogany jasper)
Jasper—microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions
mineral
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Small red-brown mineral or rock fragment
Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide
mineral
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic