Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Granite Pebble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Gneiss (Pebble)
Gneiss
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Schist (specifically Mica Schist)
Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)
metamorphic
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Red Sandstone
Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)
sedimentary
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Schist
Mica Schist
metamorphic
Bi-Color Tourmaline (or Watermelon Tourmaline)
Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)
Mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene minerals)
Igneous
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Red Aventurine
Aventurine Quartz (SiO2 + Hematite/Goethite)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Granite Gneiss
Gneiss (High-grade regional metamorphic rock)
Metamorphic
Sandstone
Arenite (a specific type of sandstone with less than 15% matrix)
Sedimentary rock
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 predominantly)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Unakite
Epidotized Granite (Composed of Orthoclase Feldspar, Epidote, and Quartz)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic