Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary Or Igneous (Secondary Formation)
Browse sedimentary or igneous (secondary formation) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Igneous (Secondary Formation) in the encyclopedia
View all →
Weathered jasper-rich ironstone
Brecciated jasper/chert with iron oxides and hydroxides (SiO₂ with hematite, goethite, and limonite)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Pyritic Gneiss (with Garnet)
Gneiss containing Pyrite (FeS2) and Almandine Garnet (Fe3Al2(SiO4)3)
metamorphic
Vesicular basalt (likely scoria)
Vesicular basalt; predominantly plagioclase, pyroxene, and possibly olivine
igneous
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
metamorphic
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Hematite
Hematite (Α-Fe2O3)
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Mica-bearing metamorphic rock, likely schist
Muscovite/biotite mica schist with quartz and feldspar
metamorphic
Copper Ore
Mixed copper sulfides/oxides in gangue matrix
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular basalt (weathered lava rock)
Basalt, predominantly plagioclase, pyroxene, and minor olivine/iron oxides
igneous
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Unidentifiable Specimen
Undetermined
Unknown
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Weathered granitic or feldspathic pebble
Likely granite/granodiorite; quartz–feldspar–mica aggregate
igneous
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Slag
Metallurgical Slag
igneous
Blue Lace Agate
Microcrystalline Quartz (Chalcedony), SiO2
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Assorted gemstone jewelry
Mixed natural and synthetic gemstone cabochons and faceted stones; individual species cannot be determined reliably from this image
gemstone
Greenstone / Graywacke
Metagraywacke or Chlorite Schist
metamorphic
Polished volcanic scoria or vesicular basalt
Vesicular basalt; primarily plagioclase, pyroxene, and iron-rich glass/oxides
igneous
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Vesicular basalt (possibly scoriaceous basalt)
Basalt, chiefly plagioclase feldspar, clinopyroxene, and iron-titanium oxides
igneous
K2 Jasper (K2 Granite)
Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)
igneous
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Pyrite-bearing schist or quartzite
Micaceous quartz-rich metamorphic rock with pyrite (FeS₂)
metamorphic
Likely weathered schist or gneiss fragment
Micaceous quartz-feldspar metamorphic rock; exact identification requires testing
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary or Igneous host
mineral
Weathered schist or gneiss boulder
Micaceous quartz-feldspar schist/gneiss; exact identification is limited by the photograph
metamorphic
Weathered rock fragment (likely granite or quartz-rich sandstone)
Uncertain; possible granitic fragment containing quartz and feldspar
igneous
Hematite
Iron (III) Oxide (Fe2O3)
mineral