Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Pegmatite (Granitic)
Granite Pegmatite
igneous
Hoodoo (Limestone / Siltstone Formation)
Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)
sedimentary
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Orange Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Pumice
Pumicite
igneous
Limonite after Pyrite (Prophecy Stone)
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
Mineral pseudomorph
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Prasiolite (Green Quartz) / Sea Glass Amalgam
SiO2 (Silicon Dioxide)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Anthracite Coal
Anthracite
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)
Silicon
Element Si
mineral
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Laterite
Laterite (Iron and aluminum-rich residual rock)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
gemstone
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Satin Spar (commercially called Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
sedimentary
Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Pink Chalcedony (Agate/Jasper blend)
Silicon Dioxide (SiO₂)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary