Polished brecciated turquoise-like copper mineral
Likely chrysocolla–malachite–limonite assemblage; possibly turquoise-bearing copper ore
mineral
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 →
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Hypersthene
Hypersthene (Enstatite variety), (Mg,Fe)SiO3
Mineral
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic inclusions
sedimentary
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Shale or Slate
Shale (Sedimentary) or Slate (Metamorphic)
sedimentary or metamorphic
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Mica Schist
Schist (biotite/muscovite schist)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Mica schist, likely biotite–muscovite schist
Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.
metamorphic
Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Slate
Foliated Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Mookaite Jasper
Silicified radiolarian ooze (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Emerald
Beryl (Be3Al2Si6O18 with chromium and vanadium impurities)
gemstone
Smoky Quartz
Silicon dioxide (SiO2)
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Coquina / Shelly Sandstone
Calcareous Sandstone / Coquina
sedimentary
Yellow Sapphire
Corundum (Al2O3)
mineral
Anthracite
Anthracite coal
metamorphic
Nephrite Jade
Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Green Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Clear Quartz (Faceted) / White Sapphire / Goshenite
Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)
gemstone
Fossil shell or shell fragment
Likely a calcareous bivalve or gastropod fragment; precise identification requires locality and microscopy
fossil
Black Opal
Amorphous hydrated silica (SiO2 nH2O)
mineral
Orthoclase Feldspar (Salmon variety)
Orthoclase, KAlSi3O8
mineral
Anthracite Coal
Anthracite
metamorphic
Garnet in Matrix
Almandine or Spessartine Garnet in Quartz/Schist Matrix (X3Al2(SiO4)3)
metamorphic
Weathered greenstone pebble
Metamorphosed mafic rock, commonly metabasalt or greenschist (exact identification requires testing)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral