Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
Learn about Man Made Material in the encyclopedia
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Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint Arrowhead)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Tumbled fossil shark tooth pendant
Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image
fossil
Gemstone ring (stones not reliably identifiable from the image)
Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually
gemstone
Diamond
Native Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Weathered concrete or cementitious slab (not natural rock)
Artificial calcium-silicate cement composite; likely Portland cement concrete
sedimentary
Yellow faceted gemstone, likely citrine or yellow sapphire
Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)
gemstone
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Tumbled cream-colored pebble
Likely quartz-rich sandstone or limestone; exact identification requires testing
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Carved labradorite fish
Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)
mineral
Diamond
Carbon (C)
mineral
Tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Chert (Honey Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone (blue/black aventurine glass)
Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Yellow faceted gemstone, likely citrine or synthetic glass
Citrine (quartz, SiO₂) is the leading natural possibility; visual identification is uncertain from the photograph
gemstone
Polished amethyst-bearing quartz
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Red coral (likely precious coral)
Corallium sp.; calcium-carbonate skeleton, primarily calcite
gemstone
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary