Chalcedony
Chalcedony (SiO2)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
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Carnelian
Chalcedony (SiO2)
mineral
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony Agate Geode / Nodule
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Pyrite in Slate or Shale
Iron Sulfide (FeS2) in Argillaceous Matrix
mineral
Crazy Lace Agate
Silicon Dioxide (SiO2)
sedimentary
Black Opal Ring (Carved Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Chalcedony Nodule / Agate
Silicon Dioxide (SiO2)
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon Dioxide, variety of chalcedony (SiO2)
gemstone
Chalcedony
Silicon Dioxide (SiO2)
mineral
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral
Cinnabar in Matrix
Cinnabar (Mercury(II) sulfide, HgS)
mineral
Chalcedony (specifically Agate or Moonstone-like Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Chalcedony (cryptocrystalline Silicon Dioxide - SiO2)
mineral
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Carnelian
Carnelian (SiO2 - Chalcedony colored by Iron Oxide)
mineral
Carnelian
Carnelian Agate (SiO2)
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Grey Chalcedony
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Blue Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Amber
Succinite (Fossilized Tree Resin)
mineral
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Ruby
Corundum (Al2O3)
mineral
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Biotite–quartz–feldspar gneiss
Gneiss, composed chiefly of quartz (SiO₂), feldspar, and dark mica, likely biotite
metamorphic
Amber
Succinite (amorphous organic polymer)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dumortierite Quartz
Dumortierite (Al7BO3(SiO4)3O3) in Quartz (SiO2)
metamorphic
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade