Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Category
Igneous Or Sedimentary
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Chalcedony
Chalcedony (SiO2)
mineral
Carnelian (Carnelian Agate)
Carnelian (Silicon Dioxide - SiO2)
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Pyritic Gneiss
Metamorphic Gneiss with Pyrite inclusions
metamorphic
Banded Gneiss
Gneiss
metamorphic
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Gneiss
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
Banded gneiss
Quartz–feldspar gneiss, possibly biotite-bearing; exact identification requires testing
metamorphic
Biotite-rich gneiss or schist
Mica gneiss/schist; primarily quartz, feldspar, biotite, and possibly amphibole
metamorphic
Gray metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and tests
metamorphic
Gneiss
Gneiss
metamorphic
Gray foliated metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and testing
metamorphic
Unidentified gray metamorphic rock, likely schist or gneiss
Quartz–feldspar–mica metamorphic rock; exact identification requires testing
metamorphic
Gneiss
Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)
metamorphic
Dark gneiss or banded metamorphic rock
Banded quartz–feldspar–mica gneiss; exact identification requires testing
metamorphic
Gneiss
Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Banded Agate (Agatized Geode Slice)
Silicon Dioxide (SiO₂)
mineral
Gneiss
Gneiss
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide / Chlorite inclusions
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
metamorphic
Gneiss (with iron staining)
Gneiss
metamorphic
Rounded river pebble, likely quartz-rich sandstone or fine-grained granite
Indeterminate from photograph; possible quartz/feldspar-bearing granitic pebble
igneous
Dendritic Agate
Silicon Dioxide (SiO2) with manganese/iron inclusions
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Gneiss
Gneiss
metamorphic