Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Mineraloid
Browse organic mineraloid specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood / Xylopal
fossil
Red Jasper
Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Black Beach Pebble (Basalt / Slate Pebble)
Rounded Fine-Grained Clastic / Igneous Rock Pebble
sedimentary
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structures, SiO2)
fossil
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)
Petrified Wood
Silicified Wood (SiO2)
fossil
Green Chert (Jasper)
Microcrystalline Quartz (SiO2) with chlorite/epidote inclusions
sedimentary
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Gastropod Fossil (Internal Mold)
Phylum Mollusca, Class Gastropoda (Steinkern)
sedimentary
Chert (specifically Jasper or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Chert (Chert Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Iron-stained River Cobble)
Microcrystalline Quartz (SiO2)
sedimentary
Graphite
Graphite (C)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Coral (Agatized Coral)
Fossilized Anthozoa (Silicon Dioxide replacement - SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Travertine (Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Dyed Coral
Calcium carbonate (CaCO3) - Calcite or Aragonite with dye
organic gemstone
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Wood Beads (Palmwood/Ebony)
Various species for wood, but often refers to woods like Palmwood (e.g., Borassus flabellifer) or Ebony (Diospyros spp.) for their distinctive grain and hardness.
Organic Gem Material (Botanical)
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Dog (Sleeping)
Canis familiaris (or Canis lupus familiaris)
Organic/Biological
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Ambergris
Ambrein (C30H52O Derivative)
Organic (Zoogenic)
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil