Rounded limestone pebble
Limestone, predominantly calcite (CaCO₃)
sedimentary
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
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Calcite-rich limestone
Limestone, predominantly calcium carbonate (CaCO₃), usually calcite
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Banded Onyx (Green Onyx)
Banded Calcite or Travertine (CaCO3)
Sedimentary
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Limestone Pebble
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2)
mineral
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich polymict conglomerate (possibly hydrothermal breccia)
Clast-supported polymict conglomerate dominated by quartz; includes chalcedony/quartz and dark lithic clasts
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Quartz with Host Rock
SiO2 (Quartz) with fine-grained Matrix
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Taconite/Itabirite)
sedimentary
Oolitic Chert
Silicon Dioxide (SiO2) with oolitic texture
sedimentary
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz inclusion
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
mineral
Aragonite Star Cluster
Aragonite (CaCO3)
mineral
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Polished banded ironstone pebble
Banded iron formation (BIF), chiefly hematite/magnetite and quartz
sedimentary
Banded ironstone pebble
Banded iron formation (BIF), chiefly quartz/chert and iron oxides; possibly hematite–magnetite-rich jasper
sedimentary
Banded iron formation (iron-rich chert), possibly jasper
Banded iron formation; alternating microcrystalline quartz (SiO₂) and iron oxides/hydroxides (hematite, magnetite, goethite)
sedimentary
Banded iron formation (ironstone), likely hematite–magnetite jasper
Banded iron formation (BIF), chiefly Fe₂O₃ hematite, Fe₃O₄ magnetite, and SiO₂ quartz/chert
sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
sedimentary
Green Jasper / Chert Pebbles
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Jasper
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Agate (Beads)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Chert Pebble (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Native Gold (in earring form)
Gold (Au)
mineral
Banded iron formation pebble (likely jasper-rich ironstone)
Banded iron formation (BIF), composed mainly of hematite/magnetite and microcrystalline quartz (chert/jasper)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Dyed Blue Agate
Silicon dioxide (SiO2) with artificial pigment
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous