Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Category
Organic (Biological Organism)
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Limestone Fragment
Sedimentary rock (primarily Calcium Carbonate, CaCO3)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartzite
Quartzite (primarily SiO2)
metamorphic
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Fossilized Nut / Coprolite / Concretion
Trace Fossil / Permineralized Plant Material
fossil
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Moss Agate
Silicon Dioxide with inclusions (SiO2 + impurities)
mineral
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Ambergris (Marine Coprolite/Subfossil)
Marine organic coprolite / Ambergris (Physeter macrocephalus metabolite)
fossil
Anthracite Coal
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Coal (Anthracite)
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Tumbled moss agate
Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions
mineral
Amber
Fossilized Tree Resin
gemstone
Concretion
Septarian or Siderite Concretion
sedimentary
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Banded Siltstone Pebble
Siltstone (primarily SiO2, Al2O3, Fe2O3)
sedimentary
Desert Rose Fragment (Atypical) / Weathered Chert
Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy
sedimentary
Amber
Succinit (C10H16O)
mineraloid
Fossilized Bivalve Shell
Bivalvia (fossil specimen)
sedimentary
Amber
Succinite (Resinite), C10-H16-O
mineral
Amber
Succinite
Organic Gemstone (sedimentary associations)
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
mineraloid
Fossiliferous Limestone Pebble
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Pearl (Biogenic Gemstone)
Calcium Carbonate (Aragonite and Calcite) with Conchiolin
gemstone
Fossilized Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil