Gabbro
Phaneritic Mafic Plutonic 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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Granite
Granite (Felsic Plutonic Rock)
igneous
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Siltstone
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Porrphyritic pink granite (weathered)
Granite, commonly composed of quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
igneous
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Clear calcite cleavage fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Obsidian
Obsidian (volcanic glass)
igneous
Schist
Metamorphic rock (Schist)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Lapis Lazuli
Lazurite-rich metamorphic rock (complex silicate)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Weathered granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Quartzite
Quartzite (composed mainly of SiO2)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Epidosite
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Weathered basalt
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Rounded basaltic cobble
Basalt, likely amygdaloidal or fine-grained mafic volcanic rock
igneous
Rounded quartz-veined pebble
Likely quartz-veined metamorphic rock; exact host rock is indeterminate from the image
metamorphic
Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
sedimentary
Quartz-rich rock, likely quartzite
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Diorite
Intermediate Intrusive Igneous Rock
igneous
Quartzite pebble
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Gray slate
Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Sandstone or possibly a conglomerate
Arenite (if sandstone)
sedimentary
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Granite
Intrusive Felsic Igneous Rock
igneous
Granite-like gneiss
Foliated granitic gneiss, composed mainly of quartz, feldspar, and mica
metamorphic
Blue Sapphire
Corundum (Al2O3 with iron and titanium trace elements)
mineral