Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
Browse man made material, not a natural rock or mineral specimen specimens identified by the Rock Identifier community.
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Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Quartzite with inclusions or a banded chert
Quartzite or Chert
Metamorphic or Sedimentary
Riverstone Jasper (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Red Jasper
Silicon Dioxide with iron impurities (Quartz variety, SiO2)
sedimentary
Botryoidal chalcedony (gray agate/jasper-like silica)
Microcrystalline quartz, SiO₂; likely chalcedony with opaque quartz or jasper inclusions
mineral
Quartzite (with Iron Staining)
Metamorphic Quartzite (SiO2)
metamorphic
Peacock Ore (Bornite or Chalcopyrite)
Bornite (Cu₅FeS₄) or iridescent Chalcopyrite (CuFeS₂)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Rough Diamond
Carbon (C)
gemstone
Chert (and Agate/Quartz in Geode-like Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Quartz-rich metamorphic rock (likely mica schist or gneiss)
Quartz–feldspar–mica assemblage; probable biotite schist/gneiss
metamorphic
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Milky and Smoky Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Biotite schist (likely graphite-bearing)
Mica schist; chiefly quartz + biotite mica, with possible graphite and feldspar
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Serpentine-rich serpentinite pebble
Serpentinite, composed chiefly of serpentine-group minerals (lizardite, antigorite, chrysotile), commonly with magnetite and minor brucite
metamorphic
Citrine
Silicon dioxide (SiO2)
mineral
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix
mineral
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Green Quartzite
Quartzite (SiO2 with chlorite/epidote inclusions)
metamorphic
Graphite-bearing metamorphic rock (probable graphite schist)
Graphite schist; predominantly quartz–mica–graphite, with possible feldspar and sulfide minerals
metamorphic
Tumbled jasper or rhyolitic porphyry
Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized
igneous
Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary