Jasper (likely Polychrome or Mookaite variants)
Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions
sedimentary (chemically precipitated)
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Marcasite on Agate / Sphalerite-Pyrite Agate Geode Slice
Marcasite (FeS2) / Pyrite on Quartz (SiO2)
mineral
Slate
Slate (Metamorphic Rock)
metamorphic
Banded iron formation fragment (likely hematite–magnetite ironstone)
Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)
sedimentary
Weathered limestone
Calcite-rich limestone (primarily CaCO₃)
sedimentary
Chert (with Manganese Dendrites)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert Nodule / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety
mineral
Likely halite (rock salt)
Halite, NaCl
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Sandstone
Arenite with iron oxide cement (predominantly SiO2 with Fe2O3)
sedimentary
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Dyed Agate
Silicon dioxide (SiO2) with artificial colorant
gemstone
Limestone
Calcium carbonate (CaCO3) / Limestone
sedimentary
Chert (Flint Flake)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous Concretion)
Arenite (with iron oxide cement)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite Cobble
Quartzite (chemically SiO2)
metamorphic
Gray Quartzite Pebble
Quartzite (chemically SiO2)
metamorphic
Chert (River Pebble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Yellow Jasper / Chert
Silicon Dioxide (SiO2) with Goethite or Limonite inclusions
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Quartz-rich mineral fragment
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Banded Iron Formation (BIF) / Ironstone Conglomerate
Ironstone (Hematite/Goethite rich sedimentary rock)
sedimentary
Chert (Nodular)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (Yellow/Orange variety)
Quartzite (primarily SiO2)
metamorphic