Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
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Organic (Often Found By Beachcombers)
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Amber
Succinite (with a generalized formula of C10H16O)
mineral
Dendritic Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Chert Nodules (with Flint core)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Fossiliferous Limestone (Coquina / Shell Limestone)
Bioclastic Limestone (CaCO3)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper-like Silicate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Silty Shale or Mudstone
Siltstone/Mudstone (Clastic Sedimentary Rock)
sedimentary
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Jasper or Agate (Chalcedony)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Green Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succiniferous fossil resin (C10H16O)
mineral
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Amber
Succinite (Resinite)
mineraloid
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Chert / Jasper
Cryptocrystalline Silica (SiO2)
sedimentary
River Jasper (Chert/Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Jasper/Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite
Mineraloid
Amber
Fossilized Tree Resin (Succinate)
mineral
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone with Rugose Coral
Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)
sedimentary