Man Made Composite (Lithified Equivalent Of Sedimentary)

Likely bituminous coal or carbon-rich shale fragment

Bituminous coal; predominantly carbon with macerals and minor clay/pyrite

Iron-rich sandstone or laterite

Ferruginous sandstone; likely quartz (SiO₂) cemented by iron oxides, possibly lateritic material

Fossiliferous limestone

Bioclastic calcarenite/calcirudite, chiefly calcium carbonate (CaCO₃)

Weathered graywacke or sandstone cobble

Lithic/feldspathic sandstone; exact identification requires a fresh break or thin section

Tiger Iron

Tiger Iron (composite of Tiger's Eye, Red Jasper, and Hematite)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3)

Weathered sandstone or limestone fragment

Likely quartz-rich sandstone or calcitic limestone; exact identification is uncertain from the image

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Likely polished brown stone or mineral fragment

Indeterminate from image; possible brown jasper, chert, or agate

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Fossil shell impression or shell-bearing limestone

Indeterminate bioclastic carbonate; likely mollusk fragment preserved in limestone or mudstone

Weathered limestone pebble

Calcite-rich limestone (predominantly CaCO₃); exact identification is uncertain from the image alone.

Pink Zebra Jasper

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (major component SiO2)

Banded calcite (banded limestone/marble fragment)

Calcite, CaCO₃; likely banded calcitic marble or recrystallized limestone

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Tumbled fossiliferous limestone (likely fossiliferous marble)

Fossiliferous limestone, composed mainly of calcite (CaCO₃); the pale circular fossils appear to be shell or crinoid fragments

Fossiliferous limestone

Bioclastic limestone, primarily calcite (CaCO₃)

Sandstone

Arenite (primarily SiO2)

Likely weathered sandstone or iron-rich limestone

Indeterminate clastic carbonate rock; apparent iron-oxide staining (goethite/hematite)

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Limestone

Calcium Carbonate (CaCO3)

Coal (Anthracite or Bituminous)

Lithified plant matter (Carbon)

Sandstone

Arenite (primarily SiO2)

Rounded iron-rich sandstone or weathered ironstone pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides/hydroxides

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Likely weathered gneiss or granite fragment

Quartz–feldspar–mica aggregate; probably granitoid gneiss, identification uncertain from the photograph

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Fossiliferous Limestone with Brachiopod

Phylum Brachiopoda in calcitic matrix

Bivalve Fossil (Clam)

Class Bivalvia (e.g., Mercenaria or similar genus)

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Weathered sedimentary rock, possibly sandstone

Indeterminate clastic sediment; probable quartz-rich sandstone

Rounded quartz-rich sandstone cobble

Quartz arenite (sandstone), likely iron-stained

Fossil bivalve or brachiopod in sedimentary rock

Unidentified fossil shell impression; likely a ribbed bivalve or brachiopod preserved in shale/siltstone

Rounded gray pebble

Likely quartz-rich chert or fine-grained quartzite; exact identification is uncertain from the photograph

Yellow cabochon gemstone, likely citrine or yellow glass imitation

Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Green glass cabochon or tumbled stone

Indeterminate; likely man-made glass, possibly aventurine glass rather than a natural mineral

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Blue goldstone beads

Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli