Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Quartz (River Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Granite Pebble
Granite (Felsic intrusive igneous rock)
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Granite or Felsic Intrusive Rock (weathered)
Granite
Igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
River Stone (Basalt)
Basalt
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infillings (SiO2, (Ca,Na)2-3(Mg,Fe,Al)5Si8O22(OH)2)
igneous
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Basalt (Weathered)
Mafic Igneous Rock
igneous
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz (Rose or Milky variety fragment)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Diorite (weathered)
Intermediate plutonic igneous rock
igneous
Jasper and Quartzite Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary/metamorphic
Amethyst (as a jewelry accent)
Amethyst (Silicon Dioxide SiO2 with Iron impurities)
mineral
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Basalt Pebble
Extrusive mafic igneous rock
igneous
Basalt
Basalt (composition of plagioclase feldspar, pyroxene, and olivine)
igneous
Granite
Phaneritic plutonic rock (SiO2 > 69%)
igneous
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Milky Quartz Pebble (Tumbled Quartzite)
Silicon Dioxide (SiO2)
mineral
Chlorastrolite (Greenstone)
Chlorastrolite (Pumpellyite variety), Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O
mineral
Gold Nugget
Native Gold (Au)
mineral
Chert Nodule (River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
mineral
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary