Chert (Flint variety)
Chert (SiO2)
sedimentary
Category
Organic (Often Found By Beachcombers)
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Shungite
Shungite (carbon-rich Precambrian rock)
mineral
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Chert (often called Flint when dark)
Chert (Microcrystalline or Cryptocrystalline Silica, SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Mookaite Jasper
Siliceous (chert) sedimentary rock, a form of Jasper
Sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Amber
Succinite
Organic Mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Chalcedony (Common Opal variant)
Silicon dioxide (SiO2) with varying levels of hydration
mineral
Chert (variously known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Human Skin (Epidermis/Dermis)
Integumentary tissue (High content of hydroxyapatite in bones, though the surface is biological)
Mineral-like biological tissue
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Pyrite
Iron Disulfide (FeS2)
mineral
Amber
(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.
Mineral
Amber
Succinite (C10H16O)
mineral
Chert (variations include Flint or Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions
Mineraloid
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Chert (with Fossil Shells)
Silicon Dioxide (SiO2) with biogenic inclusions
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary
Amber
Succinite (fossilized tree resin)
mineraloid
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Petrified Wood
Silicified Wood (primarily SiO2)
fossil