Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Chemically Precipitated Mineral) in the encyclopedia
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Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
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
Quartz
Silicon Dioxide (SiO2)
mineral
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
sedimentary
Ironstone concretion (possibly pyrite-bearing)
Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Blue Celestite
Strontium Sulfate (SrSO4)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Tumbled Chalcedony)
Silicon Dioxide (SiO2)
mineral
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
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
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Tumbled metallic sulfide mineral, likely pyrite
Pyrite (FeS₂), tentatively; possibly marcasite or a pyrite-rich nodule
mineral
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Weathered quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂), possibly quartzite with iron-oxide staining
mineral
Agate (Beads)
Silicon Dioxide (SiO2)
mineral
Botryoidal quartz on matrix
Quartz, SiO₂, with possible iron-oxide-stained host rock
mineral
Weathered ironstone concretion (tentative)
Iron-oxide-rich concretion, likely goethite/limonite cementing sediment; exact identification requires examination
sedimentary
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ironstone concretion (likely limonite/goethite-rich)
Iron-oxide/hydroxide-cemented sediment, chiefly goethite (α-FeO(OH)) and limonite; exact identification requires testing
sedimentary
Quartz Crystal
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
Jasper
Silicon Dioxide (Microcrystalline Quartz)
sedimentary
Jasper
Silicon Dioxide (SiO2)
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
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Grape Agate
Silicon Dioxide (SiO2)
mineral
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary