Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
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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Granite (Fine-grained)
Phaneritic Felsic Igneous Rock
igneous
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Andesite
Intermediate Volcanic Rock (Andesite)
igneous
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Light-colored quartz-rich rock (possibly quartzite)
Quartzite, composed predominantly of quartz (SiO₂)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Fossilized Shark Teeth in Matrix
Cretaceous Chondrichthyes (Shark) remains in Sedimentary Matrix
fossil
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Botryoidal Chalcedony (Desert Rose Agate)
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Possibly banded ironstone (iron-rich metamorphic rock)
Likely iron formation, composed chiefly of hematite or goethite with silica-rich layers; exact identification is uncertain from the photo
metamorphic
Graphic Granite (or Rapakivi-textured Granite)
Alkali feldspar granite
igneous
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Greenstone (likely metamorphosed basalt)
Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz
metamorphic
Quartzite river pebble
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Botryoidal Chalcedony / Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Dalmatian Stone
Dalmatian Jasper (Aplite rock composition)
igneous
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Red Sandstone
Arenite (Fe2O3-rich)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Dark slate (probable)
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz; exact identification is uncertain from the photograph.
metamorphic
Polished brecciated jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and possibly manganese-rich inclusions
mineral
Red Sandstone
Clastic sedimentary rock (often dominated by SiO2 with Fe2O3)
sedimentary