Agate
Agate (Silicon Dioxide, SiO2)
mineral
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Liesegang Stone (Sandstone with Liesegang Rings)
Clastic sedimentary rock with li-secondary iron oxide mineralization
sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-veined Siltstone/Greywacke
Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone with Concretion
Sandstone (SiO2 dominated with Fe2O3 cement)
sedimentary
Banded Iron Formation (Chert/Jasper)
Banded Iron Formation (BIF)
sedimentary
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Chert (or Flint)
SiO2 (predominantly microcrystalline quartz)
Sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chondrite Meteorite
L or H type Ordinary Chondrite
igneous
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartzite
Metamorphic rock composed primarily of quartz (SiO2)
metamorphic
Quartzite
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Red Garnet (Almandine-Pyrope series)
Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Rose Quartz (Dyed)
Silicon Dioxide (SiO2) with trace impurities
mineral
Honey calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Jasper Mushroom Carving
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Red Jasper
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Common Green Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineraloid
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite
mineral
Banded Sedimentary Rock (Siltstone/Mudstone with concretion)
Siltstone with Ferruginous Banding
sedimentary
Lapis Lazuli (Low-grade)
Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Quartzite river stone
Quartzite (SiO2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Bauxite
Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))
sedimentary
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)