Small fossilized tooth, possibly a shark tooth
Indeterminate fossil tooth; species cannot be identified from this image
fossil
Category
Organic (Non Geological)
Browse organic (non geological) specimens identified by the Rock Identifier community.
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Fossilized wood (petrified wood)
Silicified fossil wood; commonly quartz (SiO₂) replacing wood tissues
fossil
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Tumbled olive-green stone, possibly serpentine or nephrite jade
Undetermined; likely serpentine (Mg₃Si₂O₅(OH)₄) or nephrite, a tremolite–actinolite amphibole aggregate
metamorphic
Baroque Pearl
Biogenic Calcium Carbonate (Aragonite/Conchiolin)
mineral
Orange-yellow mineral fragment (possibly sulfur)
Unidentified; color suggests native sulfur (S), but the image is insufficient for confident identification
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise bead necklace
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or imitation beads cannot be ruled out from the image
gemstone
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Amber
Succinite (Organic Mineraloid)
mineral
Fossilized coral (possible)
Indeterminate fossil; the image does not show enough diagnostic detail to identify a taxon
fossil
Amber
Succinite (a fossilized organic resin)
mineral
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Amber
Succinates (Fossilized Tree Resin)
mineral
Amber
Succiniferous fossil resin (C10H16O)
gemstone
Amber
Succinite (C10H16O)
mineral
Anthracite Coal
Anthracite (Metamorphic/High-grade Sedimentary Coal)
sedimentary
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Graphite
Graphite (Carbon, C)
Mineral
Chert Cobble / Quartzite River Stone
Microcrystalline Quartz (SiO2) / Quartzite
sedimentary
Unidentified gray rock fragment
Indeterminate from image; possibly quartz- or feldspar-rich silicate material
mineral
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Shungite
Shungite (Non-crystalline carbon, C)
mineral
Rough Amber (likely Copal or immature Amber)
Organic gemstone / Succinite (if Baltic)
mineral
Amber / Fossilized Resin
Succinite / Fossilized Tree Resin
mineral
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Amber
Amber (Amorphous Organic Hydrocarbon)
mineral
Amber
Succinite (approximate formula C10H16O)
mineral
Amber
Fossilized Tree Resin
gemstone
Amber
Succinite (fossilized resin)
mineral
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Amber
Succinite (approximate formula C10H16O)
mineral
Pearl (in Marcasite Jewelry)
Biogenic Calcium Carbonate (primarily Aragonite, CaCO3)
gemstone
Baroque cultured pearl necklace
Pearl: nacre composed mainly of aragonite (CaCO₃) and conchiolin
gemstone
Amber
Succinite (Fossilized Resin)
gemstone