Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Category
Organic Structure (Not A Rock)
Browse organic structure (not a rock) specimens identified by the Rock Identifier community.
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Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
River Rock
Sedimentary Rock (various compositions)
sedimentary
Polished ocean jasper
Microcrystalline quartz (SiO₂) with chalcedony, feldspar, and iron-oxide inclusions
mineral
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Pearls
Aragonite (calcium carbonate) and Conchiolin
Mineraloid
Not a geological specimen
N/A (man-made object)
N/A
Shale
Shale (clastic sedimentary rock)
Sedimentary
Red jasper
Jasper, a microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly colored by iron oxides and hydroxides
mineral
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image
sedimentary
Pink feldspar-rich granite
Granite, composed chiefly of quartz, potassium feldspar, and plagioclase, with minor mica or other minerals
igneous
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Druzy quartz on matrix
Quartz (SiO₂), microcrystalline crystal coating
mineral
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Fossilized Shell Fragment
Invertebrate marine fossil, likely calcium carbonate replacement
fossil
Fossilized Bone
Vertebrate fossil (mineralized bone)
fossil
Lapis Lazuli (Low Grade)
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)
metamorphic
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
sedimentary
Fossilized ammonite
Ammonoidea (likely a small, chambered ammonite fossil)
fossil
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Likely bituminous coal
Coal, predominantly carbon-rich organic matter with variable maceral and mineral content
sedimentary
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Chert (likely chalcedony-rich flint)
Microcrystalline quartz, SiO₂ (quartz/chalcedony)
sedimentary
Red-and-green jasper
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides and possibly chlorite/epidote
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Bornite (“peacock ore”), likely weathered copper sulfide
Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish
mineral
Pink granite
Granitic rock, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous