Banded gneiss or banded metamorphic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Category
Igneous Or Sedimentary (Anthropogenic Modification)
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Gneiss
High-grade Metamorphic Gneiss
metamorphic
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Labradorite-bearing gneiss or schist
Feldspathic gneiss/schist containing iridescent labradorite (plagioclase feldspar, NaAlSi₃O₈–CaAl₂Si₂O₈)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony (River Stone)
Microcrystalline Quartz (SiO2)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Gneiss
Gneiss
metamorphic
Banded Gneiss and Siltstone River Stones
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded gneiss (possibly migmatitic gneiss)
Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals
metamorphic
Likely banded gneiss or mica-rich metamorphic pebble
Gneiss; composition likely quartz, feldspar, and biotite/muscovite mica
metamorphic
Rough Agate/Chert Nodules
Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Rough Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Chalcedony (Agate Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Polished banded gneiss or amphibolite specimen
Biotite–quartz–feldspar gneiss, possibly amphibole-rich; exact identification requires testing
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Crystalline Cluster)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Chalcedony (Carnelian Agate pebble)
Silicon Dioxide (SiO2)
mineral
Foliated Gneiss (River-Worn Pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss
metamorphic
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Gneiss
Gneiss
metamorphic
Worn quartz-rich pebble
Likely microcrystalline quartz (SiO₂), possibly a weathered chert or milky quartz fragment
mineral
Banded Gneiss
Metamorphic Gneiss (High-grade regional metamorphism specimen)
metamorphic