Banded gneiss (likely migmatitic gneiss)
Gneiss; quartz–feldspar–mica metamorphic rock, locally approaching migmatite
metamorphic
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Igneous Or Sedimentary (Anthropogenic Modification)
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Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica banded rock
metamorphic
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Quartz Pebble (Geode Nodules / Stream-Rounded Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Beach Agate / Chalcedony Pebble)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded gneiss pebble
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Banded metamorphic rock, likely gneiss or banded amphibolite
Quartz–feldspar–biotite gneiss or amphibolite; exact identification requires thin-section or mineral tests
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Banded gneiss
Gneiss, likely biotite–quartz–feldspar gneiss
metamorphic
Banded Agate (Onyx variant)
Silicon dioxide (SiO2)
sedimentary
Granite Gneiss
Granitic Gneiss
Metamorphic
Banded metamorphic rock, likely gneiss or foliated amphibolite
Quartz–feldspar–mica gneiss or amphibolite; exact identification requires testing
metamorphic
Foliated metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly migmatitic gneiss
metamorphic
Polished blue-gray stone, likely labradorite or gneiss
Labradorite-bearing gneiss; plagioclase feldspar-rich rock
metamorphic
Felsic Drill Core (likely Gneiss or Granite)
Felsic Metamorphic Rock (Gneissic profile)
metamorphic
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Tumbled banded gneiss or amphibolite
Banded metamorphic rock, likely quartz–feldspar–biotite gneiss with amphibole
metamorphic
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
metamorphic
Gneissic River Pebble
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly migmatitic
metamorphic
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Fancy Jasper
Agate (Silicon Dioxide, SiO2)
sedimentary
Feldspathic Gneiss
High-grade Metamorphic Rock (Gneiss)
metamorphic
Gneiss (foliated metamorphic rock)
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic
Weathered banded metamorphic rock, likely gneiss
Banded gneiss; commonly quartz–feldspar–mica assemblage
metamorphic