Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Category
Igneous And Sedimentary
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Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Brown Chalcedony (Agate/Jasper blend)
Silicon dioxide (SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Druzy Quartz (on Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Gravel variety)
Silicon Dioxide (SiO2)
mineral
Banded gneissic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Banded gneiss (possibly migmatitic gneiss)
Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals
metamorphic
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Feldspathic Gneiss
Feldspathic Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Banded gneiss or banded metamorphic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Gneiss with Quartz Vein
Gneiss (containing SiO2 vein)
metamorphic
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded gneiss pebble
Biotite–quartz–feldspar gneiss (composition variable)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Weathered gneissic metamorphic rock
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Pyrite
Pyrite (FeS₂)
Mineral