Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Learn about Organic (Often Found By Beachcombers) in the encyclopedia
View all →
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host
mineral
Chert (specifically Jasper/Flint pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Coquina Limestone (Fossiliferous Limestone)
Calcareous bioclastic sedimentary rock (CaCO3)
sedimentary
Chert with Druzy Quartz Geode
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Chert (varieties: Flint or Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Gravel specimen)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (with Quartz Veining)
Chert (formula: SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Hag Stone / Hole Stone)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Internal Mold/Steinkern)
Class Bivalvia (Fossilized Mold)
sedimentary
Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Septarian Nodule
Calcite-bearing Septarian Concretion
sedimentary
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Ambergris
Ambrein (C30H52O)
mineraloid / organic geological substance
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Fossilized Shark Tooth (Partial)
Elasmobranchii (fossil tooth fragment)
sedimentary
Fossil Coral (Favosites)
Favosites (Order: Tabulata, Phylum: Cnidaria)
sedimentary
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite organic gemstone
mineral
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Rugose Coral (Horn Coral)
Order Rugosa (extinct coral)
sedimentary
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (variations include Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically as a lithic artifact/projectile point)
Chert (Silicon dioxide, SiO2)
sedimentary