Chert (Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral, Organic Gemstone
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Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Mineralloid (Organic gemstone)
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Amber
Succinite (Fossilized Tree Resin)
fossil
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Amber
Succinite (fossilized resin)
Organic Mineraloid
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized ammonite fragment
Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous
fossil
Polished amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral
gemstone
Yellow Chert (Chert / Cryptocrystalline Quartz)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 permineralization)
fossil
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineral
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
River Jasper (Chert/Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Amber (likely a small polished amber piece)
Natural fossil resin; amber is an organic mineraloid, not a crystalline mineral. The image alone cannot confirm authenticity.
gemstone
Amber
Succinates (Fossilized Tree Resin)
mineraloid
Amber
Succinite (C10H16O)
mineral
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Fossilized tree resin; primarily polymerized terpenoid resin (succinite)
gemstone
Pearl
Calcium Carbonate (CaCO3) in the form of orthorhombic Aragonite and Conchiolin
mineral
Chert (Brown Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter with variable maceral and mineral content
sedimentary
Amber (possibly copal)
Fossilized plant resin; amber is organic resin, commonly dominated by polymerized terpenoids
gemstone
Elephant Skin Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone