Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Mineral or Sedimentary (if chert)
Category
Sedimentary And Metamorphic
Browse sedimentary and metamorphic specimens identified by the Rock Identifier community.
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Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Magnetite / Hematite rich ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
metamorphic
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Tumbled gneiss
Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Botryoidal Pyrite
Iron Sulfide (FeS2)
mineral
Petrified wood
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing organic tissue
fossil
Slate
Foliated Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Mica Schist
Mica Schist (Quartz-Mica Schist)
metamorphic
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Mica Schist (with Muscovite)
Muscovite/Quartz Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
River Pebble (Quartzite)
Quartzite (SiO2)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Slate
Foliated Metamorphic Slate
metamorphic
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic
Jasper with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
Mineral
Tumbled quartz pebble, possibly citrine or pale smoky quartz
Quartz (SiO₂), likely microcrystalline/tumbled material
mineral
Coarse-grained granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Weathered quartz-rich metamorphic rock, likely quartzite
Quartzite (mostly microcrystalline quartz, SiO₂), possibly altered sandstone
metamorphic
Banded gneiss
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Banded gneiss
Quartzo-feldspathic biotite gneiss, possibly garnet-bearing
metamorphic
Black Slate
Slate (Metamorphic Rock)
metamorphic