Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Category
Sedimentary Or Igneous (Secondary Formation)
Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.
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Hematite
Iron Oxide (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
sedimentary
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Quartz Geode (Cracked Open Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Garnet
Garnet (X3Y2(SiO4)3)
mineral
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Hematite (Botryoidal / Kidney Ore)
Iron Oxide (Fe2O3)
mineral
Polished Hematite Tower
Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Garnet Gneiss
Gneiss containing Almandine Garnet
metamorphic
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Blue Sapphire
Corundum (Al2O3)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2)
sedimentary
Lavender Chalcedony
Silicon Dioxide (SiO2)
mineral
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Limestone with Calcite Veins
Calcium Carbonate (CaCO3) - Sparry Limestone
sedimentary
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Brown Agate
Cryptocrystalline Silica (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Native Sulfur
Sulfur (S)
mineral
Pyrite on Quartz matrix
Iron Disulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Banded Chert
Silicon Dioxide (SiO2) with impurities
sedimentary
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary