Likely beach-worn glass and a pebble
The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.
mineral
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
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Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Flint (chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Faceted clear gemstone ring, likely quartz or glass imitation
Unidentified colorless faceted material; quartz (SiO₂) is possible, but the image cannot distinguish it from glass or another gem
gemstone
Chert (flint)
Microcrystalline quartz, SiO₂ (chalcedony/quartz)
sedimentary
Blue glassy cabochon, likely blue quartz or synthetic glass
Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive
gemstone
Green jasper (possibly dyed or coated)
Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony
mineral
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Asphalt fragment
Bituminous concrete
anthropogenic material
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Tektite
Natural impact glass
meteorite
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Gold ring with a clear faceted gemstone
Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal
gemstone
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Likely flint pebble (possibly a worked flint fragment)
Microcrystalline quartz (chalcedony), SiO₂; commonly called flint
sedimentary
Quartz geode with druzy crystals
Quartz (SiO₂), likely with iron-oxide staining and darker host rock
mineral
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Granite
Granite (a plutonic rock)
Igneous
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Crinoidea Fossil
fossil
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
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Tumbled cream-colored pebble
Likely quartz-rich sandstone or limestone; exact identification requires testing
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Sandstone (Pebble)
Arenite
sedimentary
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary