Gneiss (Metamorphic Rock)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Category
Igneous Or Sedimentary
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Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Banded gneiss pebble
Gneiss, chiefly quartz–feldspar–mica with dark biotite/amphibole bands
metamorphic
Banded gneiss pebble
Biotite–quartz–feldspar gneiss (composition variable)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Banded gneiss pebble
Gneiss, typically quartz–feldspar–mica banded rock
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss (with Quartz and Mica)
Gneiss
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Weathered banded metamorphic rock, likely gneiss
Banded gneiss; commonly quartz–feldspar–mica assemblage
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss (River Cobble)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Carnelian
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
metamorphic
Carnelian / Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Banded Gneiss
Gneiss (Metamorphic rock)
metamorphic
Granite / Gneiss (Felsic Metamorphic or Igneous Rock)
Gneiss (or weathered Granite)
metamorphic
Banded gneiss
Gneiss, likely biotite–quartz–feldspar gneiss
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic