Optical Calcite (Iceland Spar)
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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Quartzite / Quartz Geodeoid Nodules
Silicon Dioxide (SiO2)
metamorphic
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Agate (Carnelian type)
Silicon Dioxide (SiO2)
mineral
Weathered vesicular basalt (likely amygdaloidal basalt)
Basalt, composed mainly of plagioclase feldspar, pyroxene, and altered olivine; cavities may contain secondary zeolite, calcite, or silica
igneous
Amethyst (Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Green Gneiss
Metamorphic Gneiss
metamorphic
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) protrusion
sedimentary
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Vesicular basalt (likely iron-rich volcanic rock)
Basalt; predominantly plagioclase feldspar, pyroxene, and commonly olivine, with iron oxides
igneous
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Greenstone
Metabasalt / Greenschist
metamorphic
Quartz Cobble (with Iron Oxide Staining)
Microcrystalline to Macro crystalline Quartz (SiO2)
sedimentary
Amethyst (Raw)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Quartz (Sea Glass or River-worn Pebble style)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire (faceted in jewelry)
Corundum (Al2O3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Yellow Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Vesicular basalt
Basalt, predominantly plagioclase + pyroxene ± olivine; vesicles formed by trapped volcanic gas
igneous
Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orange Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Vesicular Basalt
Vesicular Basalt (rich in silicate minerals mostly Plagioclase and Pyroxene)
igneous
Quartz (Druzy or Crystalline)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
igneous
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infillings (SiO2, (Ca,Na)2-3(Mg,Fe,Al)5Si8O22(OH)2)
igneous
Basalt with Epidote (Flowerstone-like texture)
Amygdaloidal Basalt (silicate mineral inclusions)
igneous