Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Category
Igneous And Sedimentary
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Gneiss
Gneiss
metamorphic
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide / Chlorite inclusions
mineral
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Dyed Agate and Citrine-style Quartz)
Silicon Dioxide (SiO2)
gemstone
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
metamorphic
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Crystal (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Geode Fragments)
Silicon Dioxide (SiO2)
mineral
Red Agate
Chalcedony (SiO2)
gemstone
Auriferous Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Gneiss
Gneiss
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Gneiss
Metamorphic Foliated Gneiss
metamorphic
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic