Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Chert (Flint) with Quartz Inclusions
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Calcite (Banded)
Calcium Carbonate (CaCO3)
mineral
Quartz Calcite Vug in Limestone
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2) inclusions
sedimentary
Weathered quartz-rich stone, possibly fossiliferous limestone
Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Green Chert
Silicon Dioxide (SiO2)
sedimentary
Greenstone / Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), likely jasper/chert; exact identification is uncertain from the photograph
sedimentary
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Yellow jasper-like chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained jasper or chert
mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Blue calcite geode
Calcite (CaCO₃), commonly a druse-lined geode
mineral
Quartzite Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Concretion
Sedimentary Concretion
sedimentary
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Yellow Calcite (Polished)
Calcium Carbonate (CaCO3)
mineral
Chert (Flint)
Chert (Cryptocrystalline Silica/SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Siltstone Pebble
Siltstone (primarily SiO2, Al2O3, Fe2O3)
sedimentary
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Chert (specifically Gray Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Dyed and polished agate cabochon
Microcrystalline quartz (chalcedony), SiO₂; likely colored or composite agate
gemstone
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Flint/chert projectile point
Microcrystalline quartz (SiO₂), archaeologically worked into a bifacial point
sedimentary
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
metamorphic
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral