Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
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 →
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Pink/Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Brown variety)
Silicon Dioxide (SiO2)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Jasper
Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)
sedimentary
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Stromatolite (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Banded Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (River Siltstone)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Grey/Black variety)
Chert (Silicon Dioxide, SiO2)
sedimentary
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Chert (Yellow Jasper/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Jasper in this color variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Yellow Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions
sedimentary
Red Jasper with Fossils
Silicified Fossiliferous Jasper (Chert variant, SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Septarian Nodule (Thunder Egg)
Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)
sedimentary
Chert (Weathered)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
metamorphic
Chert (variously identified as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Chert (Pink variety)
Microcrystalline Quartz (SiO2)
sedimentary
Black Marble
Recrystallized Limestone (CaCO3)
metamorphic
Pearl
Calcium carbonate (CaCO3) as Aragonite or Calcite
mineral
Chert (often called Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Chert (Beach Pebble)
Silicon Dioxide (SiO2)
sedimentary
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
organic material
Septarian Nodule (Dragon Stone)
Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)
sedimentary