Petrified Wood
Silicified Wood (SiO2)
metamorphic
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Brown Pebble (River Rock)
Indeterminate (Likely Silicon Dioxide / Quartz-rich)
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz composition)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
metamorphic
Granite River Pebble
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Gneiss (Granite Gneiss)
Gneiss
metamorphic
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Greenstone with Quartz Veining
Epidiorite or Metabasalt with SiO2 (Quartz) veins
metamorphic
Greenstone
Greenschist (primarily composed of chlorite, actinolite, and epidote)
metamorphic
Banded Gneiss (River Cobble)
Gneiss (High-grade regional metamorphic rock)
metamorphic
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Unakite (Epidotized Granite)
Unakite (Rock composed of Epidote Ca2(Al,Fe)3(SiO4)3(OH), Orthoclase KAlSi3O8, and Quartz SiO2)
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz-rich Rock (SiO2 with Fe2O3)
metamorphic
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Gneiss (Schistose)
Gneiss
metamorphic
Schist
Mica Schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Fuchsite on Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities
metamorphic
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Shale
Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)
sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral