Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Sedimentary Depending On Local Grade in the encyclopedia
View all →
Quartzite
Quartzite (SiO2)
metamorphic
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Ferruginous Sandstone
Ferruginous Sandstone (Quartz grains with Iron Oxide cement)
sedimentary
Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Mica Schist (with Muscovite mica)
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica assemblage
metamorphic
Chert (Yellow or Ochre Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Garnet-bearing metamorphic rock, likely garnet schist or amphibolite
Almandine garnet (Fe₃Al₂Si₃O₁₂) in mica- or amphibole-rich matrix
metamorphic
Ferruginous Sandstone
Arenite with limonite/goethite cement
sedimentary
Glacial Erratic Boulder (Sandstone / Granite)
Glacial Erratic / Sandstone (SiO2 dominated)
sedimentary
Sandstone (Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Weathered quartz-rich rock, likely quartzite or quartz vein
Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained
metamorphic
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Fossilized Bone Fragment
Permineralized Skeletal Element (Likely Vertebrate)
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Fragmented Sedimentary Pebble
Clastic Sedimentary Specimen
sedimentary
Chert (or Ironstone Nodule)
Silicon Dioxide (SiO2) or Limonite-stained Cryptocrystalline Quartz
sedimentary
Chert Nodule (Commonly known as Flint or River Rock)
Silicon Dioxide (SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Fossil-bearing sandstone or mudstone
Indeterminate sedimentary matrix with a possible bivalve or shell fossil
fossil
Greenstone / Serpentinite Pebble
Serpentinite (Hydrated Magnesium Silicate, Mg3Si2O5(OH)4)
metamorphic
Banded gneiss
Orthogneiss or paragneiss, chiefly quartz–feldspar–mica
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Calcite with iron staining
Calcium Carbonate (CaCO3)
mineral
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Fossiliferous Sedimentary Rock (Coquina/Limestone)
Fossiliferous Calcarenite / Bioclastic Limestone
sedimentary
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Chert (Quartz Variety)
Microcrystalline Silica (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Fossilized Bone Fragment
Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)
sedimentary
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Anthracite Coal
Anthracite
metamorphic
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Sandstone (Nut-stone / Cup-stone artifact)
Quartz Arenite / Worked Sedimentary Rock
sedimentary
Chert or siliceous limestone fragments
Microcrystalline quartz (chert) and/or calcarenite; exact identification is uncertain from the photograph
sedimentary