Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Category
Anthropogenic Specimen (Man Made)
Browse anthropogenic specimen (man made) specimens identified by the Rock Identifier community.
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Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Fulgarite
Fulgurite (Lechatelierite / Vitrified Sand)
igneous
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Native Silver
Silver (elemental Ag)
mineral
Diamond
Carbon (C)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Yooperlite (fluorescent syenite)
Syenite containing fluorescent sodalite, chiefly Na₈(Al₆Si₆O₂₄)Cl₂
igneous
Malachite
Malachite, Cu₂CO₃(OH)₂; a banded botryoidal copper carbonate specimen
mineral
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Seven Chakra Bonded Stone
Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz
metamorphic
Amber-set ring
Amber (fossilized plant resin; organic mineraloid), set in a metal ring
gemstone
Chert Arrowhead (Jasper)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Chert (likely jasper/chalcedony-rich chert)
Microcrystalline quartz, SiO₂
sedimentary
Trilobite fossil
Trilobita (exact species indeterminable from the image)
fossil
Chert (flint)
Microcrystalline quartz (SiO₂), commonly called chert; brown varieties may be termed brown flint
sedimentary
Green iridescent glass cabochon or synthetic gemstone
Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone
gemstone
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Polished greenstone/serpentine pebble (probable)
Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite
metamorphic
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Obsidian
Obsidian (Volcanic Glass)
igneous
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Fossil shark tooth in sediment
Likely fossilized shark tooth, possibly *Carcharhinus* or *Otodus*; exact identification requires the tooth’s full morphology and locality
fossil
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Crinoidea Fossil
fossil
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Faceted colorless gemstone, likely quartz or glass imitation
Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass
gemstone
Ferruginous Slag (Iron Smelting Byproduct)
Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)
Mineraloid/Anthropogenic (Technofossil)
Diamond
Carbon (C)
gemstone
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material