Rock Identifier

Category

Organic (Geological Relative)

Browse organic (geological relative) specimens identified by the Rock Identifier community.

Vesicular Basalt / Scoria (with Iron Oxide Alteration) (Vesicular Basalt) — igneous

Vesicular Basalt / Scoria (with Iron Oxide Alteration)

Vesicular Basalt

Tufa (Vesicular Limestone) (Tufa (form of Calcium Carbonate, CaCO3)) — sedimentary

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Vesicular basalt (scoriaceous basalt) (Basalt, primarily plagioclase feldspar, clinopyroxene, and Fe-Mg minerals; locally glassy) — igneous

Vesicular basalt (scoriaceous basalt)

Basalt, primarily plagioclase feldspar, clinopyroxene, and Fe-Mg minerals; locally glassy

Amber (Succinite (Approximate formula: C10H16O)) — mineral

Amber

Succinite (Approximate formula: C10H16O)

Basalt (Mafic Volcanic Rock) — igneous

Basalt

Mafic Volcanic Rock

Black Freshwater Pearls (Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3) — mineral

Black Freshwater Pearls

Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3

Amber (Black) (Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)) — Mineraloid

Amber (Black)

Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)

Basalt (Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)) — igneous

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Marble (Metamorphosed Limestone (principally CaCO3)) — metamorphic

Marble

Metamorphosed Limestone (principally CaCO3)

Moqui Marble (Shaman Stone) (Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core) — sedimentary

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core

Iron-rich laterite or limonite/goethite specimen (Hydrated iron oxides/hydroxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), possibly hematite (Fe₂O₃)) — mineral

Iron-rich laterite or limonite/goethite specimen

Hydrated iron oxides/hydroxides, chiefly goethite (FeO(OH)) and limonite (variable FeO(OH)·nH₂O), possibly hematite (Fe₂O₃)

Dark gray fine-grained stone, likely basalt (Basalt; primarily plagioclase feldspar and pyroxene, commonly with minor olivine and iron oxides) — igneous

Dark gray fine-grained stone, likely basalt

Basalt; primarily plagioclase feldspar and pyroxene, commonly with minor olivine and iron oxides

Chrysocolla-rich copper ore (probable chrysocolla with malachite) (Chrysocolla, hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possible associated malachite, Cu₂CO₃(OH)₂) — mineral

Chrysocolla-rich copper ore (probable chrysocolla with malachite)

Chrysocolla, hydrated copper aluminosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possible associated malachite, Cu₂CO₃(OH)₂

Iron-rich breccia or weathered ironstone (Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments) — igneous

Iron-rich breccia or weathered ironstone

Goethite–hematite-bearing limonite, possibly with quartz and altered rock fragments

Polished malachite cabochon (Malachite, Cu₂CO₃(OH)₂) — mineral

Polished malachite cabochon

Malachite, Cu₂CO₃(OH)₂

Gneiss (Gneiss (High-grade metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade metamorphic rock)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Chert (Jasper variation) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variation)

Silicon Dioxide (SiO2)

Desert Rose Fragment (Atypical) / Weathered Chert (Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy) — sedimentary

Desert Rose Fragment (Atypical) / Weathered Chert

Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy

Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Glauconitic Sandstone (Glauconitic Quartz Arenite) — sedimentary

Glauconitic Sandstone

Glauconitic Quartz Arenite

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert

Cryptocrystalline Quartz (SiO2)

Malachite cabochon or polished bead (Malachite, Cu₂CO₃(OH)₂) — mineral

Malachite cabochon or polished bead

Malachite, Cu₂CO₃(OH)₂

Tumbled carnelian (Carnelian, a translucent orange-red variety of chalcedony (microcrystalline quartz), SiO₂) — gemstone

Tumbled carnelian

Carnelian, a translucent orange-red variety of chalcedony (microcrystalline quartz), SiO₂

Howlite (polished/tumbled) (Howlite — hydrated calcium borosilicate, Ca₂B₅SiO₉(OH)₅) — mineral

Howlite (polished/tumbled)

Howlite — hydrated calcium borosilicate, Ca₂B₅SiO₉(OH)₅

Polished turquoise cabochon jewelry (likely composite or stabilized turquoise) (Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O) — mineral

Polished turquoise cabochon jewelry (likely composite or stabilized turquoise)

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O

Green Onyx (Carved Mushroom) (Calcite / Banded Calcite (often commercially sold as 'Mexican Onyx')) — sedimentary

Green Onyx (Carved Mushroom)

Calcite / Banded Calcite (often commercially sold as 'Mexican Onyx')

Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”) (Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix) — metamorphic

Polished serpentine-rich stone (likely serpentine jasper or “rainforest jasper”)

Serpentine-group minerals, chiefly antigorite/lizardite, with iron oxides and silica-rich rock matrix

Orange Calcite (Polished Sphere) (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite (Polished Sphere)

Calcium Carbonate (CaCO3)

Limestone with Fossil Fragment (Sedimentary carbonate rock (CaCO3)) — sedimentary

Limestone with Fossil Fragment

Sedimentary carbonate rock (CaCO3)

Petrified Wood (Silicified Wood (primarily Quartz / Chalcedony: SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Peacock ore (Iridescent chalcopyrite, commonly bornite-coated or artificially treated copper sulfide) — mineral

Peacock ore

Iridescent chalcopyrite, commonly bornite-coated or artificially treated copper sulfide

Greenschist (Chlorite-actinolite schist) — metamorphic

Greenschist

Chlorite-actinolite schist

Ferruginous Sandstone Concretion (Ironstone Phosphorite) (Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)) — sedimentary

Ferruginous Sandstone Concretion (Ironstone Phosphorite)

Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)

Basalt (Basalt (Mafic volcanic rock)) — igneous

Basalt

Basalt (Mafic volcanic rock)

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Limonite and Goethite encrusted Chert/Ironstone (Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)) — sedimentary

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Basalt (Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)) — igneous

Basalt

Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)

Propylitic Altered Andesite (Hydrothermally Altered Andesite) — igneous

Propylitic Altered Andesite

Hydrothermally Altered Andesite