Banded Agate (Dyed)
SiO2 (Silicon Dioxide / Microcrystalline Quartz)
mineral
Category
Mineral (Organic)
Browse mineral (organic) specimens identified by the Rock Identifier community.
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Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Petrified Wood
Silicified wood (primarily SiO2)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2 / Quartz pseudomorph after wood)
fossil
Black Chert
Carbonaceous Chert (Silicon dioxide, SiO2)
sedimentary
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO₂)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron oxide concretion (contains FeO(OH)·nH2O)
sedimentary
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Chert (Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Fossilized Bone / Dinosaur Fossil
Fossilized vertebrate bone (permineralized)
fossil
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Pyrite in Limestone
Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
mineral
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Petrified Wood
Silicified Wood / Chalcedony (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Yellow Chert (Chert / Cryptocrystalline Quartz)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)