Petrified Wood
Silicified Wood (SiO2)
Category
Browse organic (pseudo geological) specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
Petrified Wood
Silicified Wood (SiO2)
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
Chert (Flint)
Cryptocrystalline quartz (SiO2)
Chert (Flint variety)
Silicon Dioxide (SiO2)
Chert (specifically Flint)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
Chert (Black Flint)
Silicon Dioxide (SiO2)
Chert (Commonly known as Flint)
Microcrystalline Quartz (SiO2)
Chert (Nodule)
Microcrystalline Quartz (SiO2)
Chert (Nodule)
Chert (Microcrystalline Quartz, SiO2)
Chert (and Limestone)
Silicon Dioxide (SiO2)
Chert (and Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Chert (and Limestone) River Cobble
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
Chert (Jasper variety)
Chert (SiO2)
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
Petrified Wood
Silicified Wood (SiO2)
Fossiliferous Limestone with Brachiopod shell
Calcium carbonate (CaCO3)
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
Petrified Wood
Silicified Wood (primarily Silicon Dioxide, SiO2)
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
Petrified Wood
Silicified Wood (primarily SiO2)
Petrified Wood
Silicified Wood (SiO2)
Lemon (Mock specimen mimicking Citrine/Sulfur)
Citrus x limon
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
Fossil Shell (Bivalve)
Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3
Banded Chert with Quartz Veining
Microcrystalline Quartz (SiO2)
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
Chert (varieties: Flint or Chalcedony)
Microcrystalline Quartz (SiO2)
Ambergris (Geological/Organic Specimen)
Ambra grisea (Produced by Physeter macrocephalus)
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
Petrified Wood
Silicified Wood (SiO2 permineralization)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
Chert / Flint
Chert (Silicon Dioxide, SiO2)