Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Browse organic (if resin) or synthetic (if glass); simulating sedimentary or metamorphic (for natural stones) specimens identified by the Rock Identifier community.

Moonstone (specifically Cat's Eye or Gray Moonstone)

Orthoclase (Potassium Aluminum Silicate) with the formula (K,Na)AlSi3O8

mineral

Magnetite (Iron Ore)

Magnetite (Fe3O4)

mineral

Sulfur (with possible Cullet Glass or Slag imitation)

Native Sulfur (S8)

mineral

Magnetite (Small Granule)

Magnetite (Fe3O4)

mineral

Dragon Blood Jasper

Epidote with Red Piedmontite (Chalcedony/Quartz variant)

sedimentary

Serpentine

Serpentine group minerals (e.g., Antigorite, Chrysotile, Lizardite). Chemical formula: (Mg, Fe)₃Si₂O₅(OH)₄

Mineral, often found as a rock (metamorphic)

Petrified Wood

Silicified wood (Quartz, SiO2)

metamorphic

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

sedimentary

Connemara Marble

Ophiocalcite (Serpentinitic Marble)

metamorphic

Fossil Coral

Cnidaria Anthozoa (Fossilized)

sedimentary

Smoky Quartz (with complementary stones in jewelry setting)

Smoky Quartz (Silicon Dioxide - SiO2)

mineral

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

metamorphic

Citrine Quartz

Silicon Dioxide (SiO2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Pyrite

Iron Sulfide (FeS2)

mineral

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Mineral (specifically a mineraloid)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

sedimentary

Magnetite (Iron Ore)

Magnetite (Fe3O4)

mineral

Dyed Howlite (Dyed Red)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

mineral

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock

sedimentary

Limestone with Calcite Veins

Calcium Carbonate (CaCO3)

sedimentary

Magnetite

Magnetite (Fe3O4)

mineral

Green Jasper

Silicon Dioxide (SiO2) with impurities of iron(II) silicate

sedimentary

Herkimer Diamond (Quartz Crystal)

Silicon Dioxide (SiO2)

mineral

Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

sedimentary (microcrystalline quartz)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Magnetite

Magnetite (Fe3O4)

mineral

Moqui Marbles

Iron Oxide Concretion (Hematite/Goethite)

sedimentary

Bornite

Bornite (Cu5FeS4)

mineral

Red Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)

metamorphic

Aquamarine (Pendant) and Jasper (Beads)

Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)

mineral

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

mineral

Chert (and Jasper blend)

Chert (Microcrystalline Quartz, SiO2)

sedimentary

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Sedimentary rock (specifically a concretion or possibly a geode)