Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Extrusive mafic igneous rock with secondary mineral infillings
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Dark-colored rock fragment, possibly basalt
Basalt (tentative; image alone is insufficient for reliable identification)
igneous
Turquoise in Matrix
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Carnelian Agate
Cryptocrystalline Quartz (SiO2) with Iron Oxide impurities
mineral
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz pebble (Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Amygdaloidal Basalt with Quartz
Basalt with Secondary Mineral Infilling
igneous
Vesicular Basalt
Basalt with secondary mineral infills
igneous
Fossiliferous Limestone
Sedimentary Calcium Carbonate (CaCO3) Matrix with Fossil Fragments
fossil
Vesicular basalt (possibly scoriaceous basalt)
Basalt, chiefly plagioclase feldspar, clinopyroxene, and iron-titanium oxides
igneous
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Red Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Limonite
FeO(OH)•nH2O
mineral
Beach Agate / Chalcedony Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz (or Chalcedony) Specimen
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Chert (with Limestone/Carbonate matrix)
Sedimentary cryptocrystalline silica (SiO2)
sedimentary
Gneiss
Metamorphic Gneiss
metamorphic
Quartz with Hematite Inclusions
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
Quartz (Milky Quartz with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix
igneous
Chalcedony (Milky Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Limonite
FeO(OH)•nH2O
mineral
Jasper and Quartzite Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary/metamorphic