Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Category
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Quartz (Milky Variant)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Green Jasper
Silicon Dioxide (SiO2) with impurities
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz
Silicon Dioxide (SiO2)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Magnetite / Hematite rich ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
Weathered sandstone or metasedimentary rock
Quartz-rich sandstone; possibly weakly metamorphosed quartzite
Quartz (Clear/Milky)
Silicon Dioxide (SiO2)
Slate fragment
Slate; predominantly fine-grained mica/clay minerals, commonly muscovite, chlorite, and quartz
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; chiefly quartz, mica, and chlorite
Pyrite
Iron Sulfide (FeS2)
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
Foliated Gneiss
Gneiss (Metamorphic Rock)
Gneiss
Foliated Metamorphic Gneiss
Gneiss
Gneissic Metamorphic Rock
Quartz pebble
Silicon dioxide (SiO2)
Blue Calcite
Calcium Carbonate (CaCO3)
Botryoidal Pyrite
Iron Sulfide (FeS2)
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
Slate
Foliated Metamorphic Rock (composed of quartz, illite, chlorite)
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
Tumbled gneiss
Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
Pyrite
Iron Disulfide (FeS2)
Petrified wood
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing organic tissue
Polished fossil coral
Fossilized coral, commonly agatized coral (silica replacing CaCO₃)
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
Banded Gneiss
Gneiss (Metamorphic Rock)
Schist
Metamorphic Rock (Schist)
River Pebble (Quartzite)
Quartzite (SiO2)
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
Quartz (likely a form of massive or vein quartz)
Quartz (SiO₂)
Banded gneiss
Gneiss, likely quartz–feldspar–mica gneiss