Organic Structure (Not A Rock)

Coal (most likely Bituminous or Anthracite)

Coal (organic sedimentary rock)

Pink feldspar-rich granite

Granite, composed chiefly of quartz, potassium feldspar, and plagioclase, with minor mica or other minerals

Fossilized Bone

Vertebrate fossil (mineralized bone)

Weathered granite cobble

Granite, a coarse-grained felsic intrusive igneous rock

Red granite boulder

Granite, a coarse-grained felsic intrusive igneous rock; commonly quartz + feldspar + mica

Jet

Lignite (Precursor organic rock)

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Fossilized Bone

Petrified Bone / Biogenic Sedimentary

Fossilized Shell Fragment

Invertebrate marine fossil, likely calcium carbonate replacement

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Petrified Wood

Silicified wood (Quartz pseudomorph after wood)

Red coral chip bracelet

Corallium spp.; skeleton composed primarily of calcium carbonate (aragonite)

Small gold-colored jewelry piece with clear stones

Likely a metal setting holding small faceted gemstones; the stones cannot be identified from the image.

Desert rose gypsum

Gypsum (CaSO₄·2H₂O), forming rosette aggregates with sand inclusions

Granite (with a dark inclusion or attached fragment)

Granite, mainly quartz, feldspar, and mica; the dark object cannot be identified confidently from the photo.

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Likely serpentinite (green serpentine rock)

Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter with variable maceral and mineral content

Fossilized Fish Vertebra

Vertebrata

Druzy quartz on matrix

Quartz (SiO₂), microcrystalline crystal coating

Fossiliferous Shale

Carbonaceous Shale (with potential plant/aquatic fossils)

Turquoise

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Fossiliferous Limestone

Calcium Carbonate (CaCO3)

Coal (likely Bituminous or Lignite)

Organic Sedimentary Rock (Carbonaceous)

Red Coral

Corallium rubrum

Tumbled red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Synthetic Wolf Plush (Non-mineral)

Canis lupus similis (Prop material: Polyester & Synthetic fibers)

Black Limestone

Bituminous Limestone (Calcium Carbonate - CaCO3)

Bivalve Shell (Fossil or Contemporary)

Class Bivalvie (various genera and species of clams, cockles, etc.)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Fossiliferous Limestone

Biogenic Sedimentary Rock (Calcium Carbonate with Fossils)

Fossilized ammonite

Ammonoidea (likely a small, chambered ammonite fossil)

Fish Fossil in Limestone

Lycoptera (likely) in Micritic Limestone

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Bauxite

Bauxite (Mixture of Hydrous Aluminum Oxides)

Fossilized Bone

Fossilized vertebrate bone

Black Limestone with Calcite Veining

Bituminous Limestone (CaCO3 with Organic Carbon inclusions)

Fossilized Bone

Permineralized Vertebrate Bone

Grass (Organic Matter/Soil)

Poaceae (family of monocotyledonous flowering plants)

Chert (likely chalcedony-rich flint)

Microcrystalline quartz, SiO₂ (quartz/chalcedony)

Red coral beads (possibly dyed or imitation coral)

Corallium spp. skeleton, composed mainly of calcium carbonate (calcite); exact material cannot be confirmed from the image