Chert (and Chert Breccia)
Silicon Dioxide (SiO2)
sedimentary
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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Healer's Gold (Iron-Stained Quartz Cluster)
Silicon Dioxide with Iron Oxide Coating (SiO2)
mineral
Chert Concretion
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
White quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Agate (Geode nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Copper-bearing sulfide ore, possibly bornite/chalcopyrite
Likely bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2) in a sulfide-rich host rock
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz (Common or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely milky quartz with drusy crystals
mineral
Quartz-rich rock fragment
Milky quartz, primarily silicon dioxide (SiO₂), possibly quartzite or a feldspar-bearing vein rock
mineral
Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Polished red jasper
Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and commonly mixed with chalcedony or other minerals
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Banded Calcite (often sold as Mexican Onyx or Aragonite)
Calcite/Aragonite (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Limestone with Brachiopod
Limestone (Calcium Carbonate, CaCO3) with Phylum Brachiopoda fossil
sedimentary
Moqui Marbles
Ironstone Concretions (Hematite / Goethite / Sandstone)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Druzy Quartz (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Moqui Marble (Ironstone Concretion)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary