Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Native Gold in Quartz
Native Gold (Au)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Diorite (Gneissic)
Diorite
igneous
Jasper
Silicon Dioxide (SiO2)
mineral
Dyed Agate
Silicon Dioxide (SiO2)
mineral
Dyed Howlite (often sold as 'Turquenite')
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Gray Agate
Cryptocrystalline Quartz (SiO2)
mineral
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Pebble (Gabbro or Basalt)
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Blue Goldstone
Aventurine Glass
Man-made mineral simulant (Glass)
Black Tourmaline (Schorl) on Quartz
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Yellow Quartz (Citrine alternative)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Black Tourmaline
Schorl (Sodium iron aluminum boron silicate hydroxide)
mineral
Dyed and Metallic Coated Agate Geode
Silicon Dioxide (SiO2) with titanium/gold vapor deposition coating
sedimentary (primary) with artificial modification
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Red Jasper
Red Jasper (SiO2)
sedimentary
Black Tourmaline (Schorl) in Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Jasper
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary