Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Pyrite (FeS₂)
Mineral
Gneiss
Metamorphic Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Biotite-rich gneiss
Foliated quartz–feldspar–mica gneiss; mainly quartz, plagioclase/alkali feldspar, and biotite
metamorphic
Yellow chalcedony or quartz fragment
Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)
mineral
Likely slate fragment
Slate; predominantly fine-grained mica/clay minerals and quartz
metamorphic
Biotite-rich gneiss
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Banded gneiss
Orthogneiss or paragneiss, chiefly quartz–feldspar–mica
metamorphic
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly migmatitic
metamorphic
Banded gneiss (polished/tumbled cobble)
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Red Jasper
Red Jasper (SiO2)
sedimentary
Gneiss with Quartz Vein
Metamorphic Gneiss
metamorphic
Metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock
mineral
Banded gneiss (likely weathered orthogneiss)
Gneiss; predominantly quartz–feldspar–mica, with possible iron-oxide staining
metamorphic
Banded gneiss cobble
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Weathered layered metamorphic rock, likely schist or phyllite
Micaceous quartz–feldspar schist/phyllite; exact identification requires a fresh surface and testing
metamorphic
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Quartzite Chert Pebble
Sedimentary Chert / Metamorphic Quartzite (SiO2)
metamorphic
Uncertain gray metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica rock; exact identification requires close examination
metamorphic
Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
mineral side rock
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Silicified oyster fossil
Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz
fossil
Anthracite Coal
Anthracite (Carbon C)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Natural freshwater pearls
Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)
gemstone
Gneiss
Metamorphic Gneiss
metamorphic
Mica Schist
Metamorphic Rock (Schistose)
metamorphic
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Magnetite with Quartz
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Likely rough quartz with iron-oxide staining
Quartz (SiO₂), possibly with iron-oxide inclusions or surface staining
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral