Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Decorative gemstone bracelet or jewelry
Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads
gemstone
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Polished jasper pendant
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions
gemstone
Yellow faceted gemstone, likely citrine or yellow sapphire
Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)
gemstone
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Tumbled cream-colored pebble
Likely quartz-rich sandstone or limestone; exact identification requires testing
sedimentary
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil or modern bivalve shell
Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image
fossil
Flint (chert) fragment
Microcrystalline quartz (SiO₂), commonly called flint when dark
sedimentary
Likely smoky quartz pendant
Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects
gemstone
Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate
Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain
gemstone
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Small water-worn pebble, likely granite or granitic rock
Granite (tentative; exact identification is uncertain from the photo)
igneous
Sandstone
Arenite
sedimentary
Tourmalinated quartz point
Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Tumbled serpentine
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄
metamorphic
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Tree Agate
Chalcedony (SiO2)
gemstone
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary