Chert with Calcite Veining
Microcrystalline Quartz (SiO2) with Calcium Carbonate (CaCO3) veins
sedimentary
Category
Organic (Often Found By Beachcombers)
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Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (specifically Brown Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
metamorphic
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Agate (Geode/Nodule)
Chalcedony (cryptocrystalline silica, SiO2)
sedimentary
Amber / Copal
Succinite (fossilized resin)
mineraloid
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (Mookaite variety likely)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Ammonite Fossil (Small Pyritized or Calcitized Internal Mold)
Ammonoidea
sedimentary
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with impurities of Hematite or Goethite
sedimentary
Grey and White Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Echinoid (Sea Urchin)
Echinoidea (Class), often found as calcitic fossils
sedimentary
Fossiliferous Limestone (Gritstone/Marl)
CaCO3 (Calcium Carbonate) with Fossil Inclusions
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Fossiliferous Siltstone
Clastic Sedimentary Rock with Fossil Inclusions
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Orthoceras Fossil Limestone
Orthoceras sp. (Calcium Carbonate, CaCO3)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Botryoidal Smithsonite
Smithsonite (Zinc Carbonate, ZnCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Amber
Succinite (fossilized resin)
mineral
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides
mineral
Fossil Plant Impression (Calamites)
Calamites sp. (Tracheophyta: Equisetopsida)
sedimentary