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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Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Quartz Crystal (Rough)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Silica-rich Concretion (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary host
sedimentary
Moqui Marble (Concretion)
Iron Oxide Concretion
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz Druse on Basalt Matrix
Silicon Dioxide (SiO2)
mineral
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (Carnelian/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Limonite / Iron Oxide Concretion
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
mineral
Quartz (Clear or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Chert Nodule or Concretion
Microcrystalline Quartz / Sedimentary Nodule
sedimentary
Banded iron formation (BIF) fragment
Metamorphosed iron formation; alternating hematite/magnetite and chert (SiO₂) layers
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Rounded ironstone concretion
Iron-rich sedimentary concretion, commonly composed of goethite and/or hematite cementing sand or clay
sedimentary
Metallic sulfide-bearing rock, likely galena-rich ore
Galena (lead sulfide, PbS), possibly mixed with pyrite/chalcopyrite and host rock
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
sedimentary
Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Weathered ironstone concretion (possible hematite/goethite concretion)
Hematite–goethite-rich ferruginous concretion; primarily Fe₂O₃ and FeO(OH) in a silica/clay matrix
sedimentary
Cave (botryoidal) aragonite or calcite specimen
Aragonite (CaCO₃), possibly mixed with calcite and iron-oxide inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Gray chalcedony (common agate/jasper fragment)
Microcrystalline quartz, SiO₂; likely chalcedony with weathered host-rock rind
mineral