Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Calcite)
sedimentary
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂), likely a massive vein-quartz specimen
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Weathered iron-rich rock, possibly limonite-bearing sandstone
Limonite/goethite-bearing sandstone or ferruginous conglomeratic rock
sedimentary
Raw pink chalcedony (likely pink agate/jasper)
Microcrystalline quartz, SiO₂ (chalcedony); impurities may include iron oxides and other silicates
mineral
Botryoidal Chalcedony on Chert
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Moqui Marble (Shaman Stone)
Ironstone Concretion (Goethite/Hematite Shell)
sedimentary
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Iron-rich concretion or weathered ironstone pebble
Goethite–hematite-bearing limonite concretion (tentative)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Quartz with Sulfide Inclusions
Silicon Dioxide (SiO2) with metallic mineral inclusions
mineral
Dyed Agate (Dragon Vein Agate Bead)
Silicon dioxide (SiO2) variety Chalcedony
gemstone
Azurite Malachite (Mixed)
Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geodic Cavity
sedimentary
Milky calcite
Calcite (CaCO₃), likely a cleavage fragment
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Limestone with Crinoid Stem
Carboniferous Limestone (containing Crinoidea ossicles)
fossil
Quartz crystal fragment (likely milky quartz)
Quartz, silicon dioxide (SiO₂), trigonal crystal system
mineral
Banded agate
Chalcedony, microcrystalline SiO₂
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Agate Sliced Nodule
Silicon Dioxide (SiO2)
mineral
Iron-rich rock or Concretion
Ironstone or Limonite concretion
sedimentary
Limonite / Iron Oxide Concretion
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Botryoidal calcite specimen
Calcite, CaCO₃, with possible dolomite or other carbonate matrix
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Iron Formation (BIF) / Ironstone
Magnetite-Hematite Quartzite / Ironstone
sedimentary