Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Likely serpentine (serpentinite) pebbles
Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly Mg₃Si₂O₅(OH)₄, sometimes containing magnetite, chromite, and minor carbonate minerals
metamorphic
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Diamond
Diamond (pure carbon C)
mineral
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
igneous
Greenschist with Quartz Veining
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Diorite
Intermediate plutonic igneous rock
igneous
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Diorite
Intermediate Phaneritic Igneous Rock
igneous
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Granite
Granite (a plutonic igneous rock)
Igneous
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Diamond
Diamond (pure Carbon, C)
mineral
Iron-stained quartzite (likely)
Quartzite, predominantly quartz (SiO₂), with iron-oxide staining and possible mica/feldspar
metamorphic
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Basalt
Basalt
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)
Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining
metamorphic
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Basalt
Basalt (Mafic volcanic rock)
igneous
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
C (Pure Carbon)
gemstone
Diamond
Carbon (C)
mineral