Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Category
Organic (Often Found By Beachcombers)
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Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Chert (often called Jasper or Flint)
Microcrystalline Silica (SiO2)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class) - Often found as Micraster or Clypeaster specimens
sedimentary
Zebra Stone (Banded Chert or Limestone)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) inclusions
sedimentary
Chert (or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Banded Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Amber (and Cubic Zirconia)
Fossilized Tree Resin
mineraloid
Flint (Chert Node)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Silica (SiO2)
sedimentary
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (Basanite variety)
Microcrystalline Quartz (SiO2)
sedimentary
Micro-crystalline Quartz Pebble (Chert)
Silicon dioxide (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (var. Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Silicon Dioxide (SiO2)
sedimentary
Desert Rose Fragment (Atypical) / Weathered Chert
Silicon Dioxide (SiO2) or Barium Sulfate (BaSO4) depending on exact mineralogy
sedimentary
Quartzite with inclusions
Quartzite
metamorphic
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
Mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Glauconite (Greensand)
Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Amber
Succinite (C10H16O)
gemstone
Chert (Jasper/Agate Peat)
Microcrystalline Quartz (SiO2)
sedimentary
Amber / Copal
Organic resin, C10H16O
mineral
Amber
Succinit (C10H16O)
mineraloid
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (Resinite), C10-H16-O
mineral
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary