Granite Pebble
Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Red Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite Cobble
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Greenstone
Metabasalt / Chlorite Schist
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (composed primarily of Fluorapatite)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Greenstone
Greenschist / Meta-basalt
metamorphic
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Quartz-veined Gneiss
Gneiss with Quartz (SiO2) intrusions
metamorphic
Schist
Mica Schist
metamorphic
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
sedimentary
Unakite
Epidote-Feldspar rock (specifically, a variety of granite)
Metamorphic rock
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Greenstone
Protolith: Basaltic rock
metamorphic
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Granite
Plutonic felsic igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Dragon Blood Jasper
Epidote-containing Quartz Chalcedony (SiO2 with Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Moonstone
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic