Rock Identifier

Category

Organic (Mineraloid)

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

Red Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Red Chert

Microcrystalline Quartz (SiO2)

Amber (Succinite (fossilized resin, C10H16O)) — mineral

Amber

Succinite (fossilized resin, C10H16O)

Limonite (Iron Ore) (Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Fossiliferous Chert (with Fossil Shells) (Silicon Dioxide (SiO2) with biogenic inclusions) — sedimentary

Fossiliferous Chert (with Fossil Shells)

Silicon Dioxide (SiO2) with biogenic inclusions

Travertine (Calcareous Tufa / Travertine (CaCO3)) — sedimentary

Travertine

Calcareous Tufa / Travertine (CaCO3)

Shale (Fissile mudstone (primarily clay minerals and silt-sized quartz)) — sedimentary

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

Mookaite Jasper (Silicified Radiolarite (SiO2 with iron impurities)) — sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Druzy Quartz on Vesicular Basalt (Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock) — igneous

Druzy Quartz on Vesicular Basalt

Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Amber (Succinite (fossilized tree resin)) — mineral

Amber

Succinite (fossilized tree resin)

Moss Agate (Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)) — mineral

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)

Amber (Succinite (Resin)) — mineral

Amber

Succinite (Resin)

Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Agate (Moss or Dendritic Agate) (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Agate (Moss or Dendritic Agate)

Chalcedony (Silicon Dioxide, SiO2)

Fossiliferous Limestone (Bioclastic Limestone (composition: CaCO3)) — sedimentary

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinite) — mineral

Amber

Succinite

Limestone with Bitumen/Chert (Calcite (CaCO3) containing organic hydrocarbons) — sedimentary

Limestone with Bitumen/Chert

Calcite (CaCO3) containing organic hydrocarbons

Chert (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Quartz, SiO2)

Fossil Shell Fragment (possibly Brachiopod or Bivalve) (Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca) — sedimentary

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Cardstock (Paper) (Cellulose (C6H10O5)n) — sedimentary (man-made)

Cardstock (Paper)

Cellulose (C6H10O5)n

sedimentary (man-made)

Petrified Wood (Silicified Wood (SiO2 permineralization)) — sedimentary

Petrified Wood

Silicified Wood (SiO2 permineralization)

Human Skin (Epidermis/Dermis) (Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)) — Mineral-like biological tissue

Human Skin (Epidermis/Dermis)

Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)

Mineral-like biological tissue

Bituminous Coal (with Anthracite or Vitrinite inclusion) (Organic-rich Sedimentary Rock (Carboniferous classification)) — sedimentary

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineral

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Mother of Pearl (Nacre) (Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers) — mineral

Mother of Pearl (Nacre)

Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers

Fossiliferous Limestone (Biomicrite / Limestone with fossils) — sedimentary

Fossiliferous Limestone

Biomicrite / Limestone with fossils

Sandstone with Algae Growth (Arenite with Chlorophyta/Lichen) — sedimentary

Sandstone with Algae Growth

Arenite with Chlorophyta/Lichen

Fossiliferous Shale (Laminated Mudrock with plant fossils) — sedimentary

Fossiliferous Shale

Laminated Mudrock with plant fossils

Chert (Nodule) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amber (Rough Baltics/Beach Specimen) (Succinicum (Organic Gemstone - Fossilized Resin)) — mineral

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Amber (Succinite (C10H16O)) — mineral

Amber

Succinite (C10H16O)

Moss Agate (Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)) — mineral

Moss Agate

Cryptocrystalline Quartz (SiO2 with manganese or iron oxide inclusions)

Calligraphy Stone (Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)) — sedimentary

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Sandstone Concretion (Arenaceous concretion (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Black Pearl (Tahitian-style Cultured Pearl) (Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)) — mineral

Black Pearl (Tahitian-style Cultured Pearl)

Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)