Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Limestone (River Stone)
Calcium Carbonate (CaCO3)
sedimentary
Granite Pebble (Weathered)
Phaneritic Felsic Igneous Rock
igneous
River Cobble (likely Basalt or Mafic Igneous Rock)
Extrusive Mafic Igneous Rock (e.g., Basalt)
igneous
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
igneous
Granite (Specimen: Logan Rock)
Phaneritic plutonic igneous rock (mainly Quartz, Feldspar, and Mica)
igneous
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Extrusive Basaltic Scoria (CaAl2Si2O8 / (Mg,Fe)2SiO4)
igneous
River Stone (Quartzite)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral
Jasper and Agate (Polished Pebble)
Chalcedony (SiO2 with impurities)
Sedimentary
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Hand-Drawn Gengar Pokémon Card Artist Item
Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)
Organic (Paper and Cellulose)
Chert (with Limestone/Carbonate matrix)
Sedimentary cryptocrystalline silica (SiO2)
sedimentary
Agate / Banded Chalcedony
Agate (Silicon Dioxide / SiO2)
mineral
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Biomicrite / Limestone with fossils
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, Chrysotile)
metamorphic
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite (Aventurine type)
Metamorphosed Quartz Sandstone (SiO2 with inclusions)
metamorphic
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Banded Agate (Tumbled)
Agate (Silicon Dioxide, SiO2 - Cryptocrystalline Quartz)
mineral
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Greenstone / Serpentinite
Serpentinite (composed primarily of minerals from the serpentine group Mg3Si2O5(OH)4)
metamorphic
Basalt (with Plagioclase Phenocrysts)
Porphyritic Basalt
igneous
Chert (White Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Manganese Dendrites/Oxide coatings
Arenite with Pyrolusite and Romanechite (MnO2)
sedimentary
Quartz nodule (River pebble)
Silicon Dioxide (SiO2)
mineral