Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
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Honey calcite (likely)
Calcite, calcium carbonate (CaCO₃)
mineral
Limonite (Yellow Ochre)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Dead Sea Salt Crust
Halite (NaCl)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Banded Chert Pebble
Silicon Dioxide (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous Concretion)
Arenite (with iron oxide cement)
sedimentary
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Weathered banded iron formation (iron-rich quartzite)
Banded iron formation (BIF), chiefly hematite/magnetite and microcrystalline quartz (SiO₂)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Onyx Marble (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodular)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper (likely Polychrome or Mookaite variants)
Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions
sedimentary (chemically precipitated)
Banded iron formation (ironstone), possibly jasper–hematite
Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (microcrystalline quartz/chert)
sedimentary
Pyrite-bearing sulfide specimen
Pyrite (FeS₂), possibly with chalcopyrite and quartz or carbonate gangue
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Banded iron formation fragment
BIF: microcrystalline quartz (chert/jasper) with iron oxides and/or magnetite
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Tufa
Calcium carbonate (CaCO3) - Porous Limestone
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz and Mixed Sedimentary Rocks
Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies
sedimentary
Chert (Flint Nodules)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Blue Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Chert with Jasper/Quartz Inclusions
Silicon Dioxide (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Quartz Vein Specimen
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral