Quartz Pebble
Quartz (SiO2)
sedimentary
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Weathered iron-rich rock, possibly limonite-bearing sandstone
Limonite/goethite-bearing sandstone or ferruginous conglomeratic rock
sedimentary
Quartz River Rock
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Flint Nodule with Chalk Cortex
Chert (Microcrystalline Quartz) SiO2
sedimentary
Fossiliferous Limestone
Biogenic Limestone (CaCO3)
sedimentary
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Iron-rich metamorphic rock (likely banded iron formation fragment)
Banded iron formation; chiefly quartz (SiO₂) and iron oxides such as hematite (Fe₂O₃) and magnetite (Fe₃O₄)
metamorphic
Red Jasper (Brecchiated Jasper)
Silicon Dioxide (SiO2) with Hematite impurities
Sedimentary / Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite with iron-oxide staining
metamorphic
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite (likely), “fool’s gold”
Pyrite, FeS₂ (iron disulfide)
mineral
Sandstone with Iron Staining
Clastic sedimentary rock (SiO2 with iron oxides)
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Honey calcite (likely calcitic limestone or marble)
Calcite — CaCO₃; possibly calcite-rich limestone/marble
mineral
Banded iron formation fragment
Banded iron formation (BIF), chiefly hematite/magnetite and chert (SiO₂)
sedimentary
Limonite (Ironstone)
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Chert / Flint (with Crinoid Stem Molds)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Orange calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Likely milky quartz-bearing rock
Quartz, silicon dioxide (SiO₂), possibly in a quartz-rich vein or sugary quartzite
mineral
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Fossilized Limestone with Crinoid Stem
Carboniferous Limestone (containing Crinoidea ossicles)
fossil
Raw yellow calcite
Calcite, calcium carbonate (CaCO₃)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Specular Hematite (on Schist/Matrix)
Hematite (Alpha-Fe2O3)
mineral
Banded Iron Formation (BIF) / Ironstone
Magnetite-Hematite Quartzite / Ironstone
sedimentary
Limestone (or Calcite Nodules)
Calcium Carbonate (CaCO3)
sedimentary
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Dyed Agate
Silicon Dioxide with artificial pigment (SiO2)
sedimentary
Quartz (Iron-stained or Chalcedony varieties)
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite, a recrystallized quartz sandstone
metamorphic
Quartzite
Quartzite (Metamorphic Quartz Arenite)
metamorphic