Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineralloid (Organic Gemstone)
Browse mineralloid (organic gemstone) specimens identified by the Rock Identifier community.
Learn about Mineralloid (Organic Gemstone) in the encyclopedia
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Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Red Chert / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Cryptocrystalline quartz (SiO2)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert or Flint)
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Amber / Copal
Succinite (fossilized resin)
mineraloid
Moss agate bracelet
Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions
gemstone
Amber (Rough)
Succinite (Resinite)
gemstone
Chert (Jasper)
Microcrystalline quartz (SiO2)
sedimentary
Red Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (specifically Flint or Common Chert)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Polished amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral
gemstone
Chert (Blue-Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or Agate nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz and Limestone Grouping
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Tumbled amber-like inclusion
Likely amber (fossilized tree resin; complex polymer), but identification is uncertain from the image
gemstone
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Amber (or polished Chalcedony bead)
Fossilized Tree Resin / SiO2 (Silicon Dioxide if Chalcedony)
gemstone
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic