Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Man Made Composite)
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
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Chalk
Calcium Carbonate (CaCO3)
sedimentary
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Yellow chalcedony (likely polished/tumbled pieces)
Microcrystalline quartz, SiO₂; commonly called yellow jasper or silicified limestone depending on exact texture
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (likely jasper/chalcedony-rich chert)
Microcrystalline quartz, SiO₂
sedimentary
Chert or silicified sedimentary fragment (tentative)
Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Carved Stone Turtle
Carved Soapstone and Quartz
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Flint
Silicon dioxide (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Tumbled cream-colored pebble
Likely quartz-rich sandstone or limestone; exact identification requires testing
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
fossil
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Porous limestone (likely fossiliferous or weathered limestone)
Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Polished black-and-golden tourmaline
Schorl–dravite tourmaline, commonly represented by black schorl over brown dravite
mineral
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary