Sandstone
Arenite
sedimentary
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
Learn about Organic Mineral in the encyclopedia
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Pyrite in Matrix (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone with Quartz Crystal Infill
Quartz-cemented quartz arenite
sedimentary
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium carbonate (CaCO3) + organic conchiolin
gemstone
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Fossil Shark Tooth
Otodus sp. or Carcharocles sp. (likely fossilized Chondrichthyes)
fossil
Sand Tiger Shark Tooth
Carcharias taurus
fossil
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Chalcedony / Agate with Botryoidal Quartz
Silicon Dioxide (SiO2)
sedimentary
Tufa Rock and Tumbled Gemstones
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Oxide inclusions
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Amber
Succinite (Fossilized Tree Resin)
gemstone
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Fossilized Shark Tooth
Carcharocles or Otodus sp. (Micro-fossilized)
sedimentary
Amber
Succinite (Fossilized Tree Resin, C10H16O)
mineral
Amber
Organic gemstone (Succinite is common if from the Baltic)
mineral
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2 with iron impurities)
sedimentary
Amber (Copal)
Fossilized Tree Resin (C10H16O)
mineral
Amber
Succinite (Resinite), C10-H16-O
mineral
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Fossilized Shell
Invertebrate fossil (Bivalvia or Brachiopoda)
fossil