None

Unknown Rock

Unknown

Unidentified Rock

Unknown

Unknown Rock Fragment

Unknown

Unidentified dark pebble

Unknown

Weathered metallic meteorite candidate

Unclassified meteorite; appearance possibly iron meteorite or stony-iron material

Obsidian

Amorphous volcanic glass (primarily SiO2)

Weathered sandstone fragment

Quartz-rich clastic sandstone, possibly arkose or lithic sandstone

Fine-grained dark igneous rock, likely basalt

Basalt (approximate identification; commonly plagioclase, pyroxene, and minor olivine)

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Limestone bedrock

Limestone, chiefly calcite (CaCO₃)

Likely serpentinite (rough green serpentinite rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, and chrysotile)

Likely assorted beach/river pebbles

Undetermined mixed lithologies; visible pieces may include quartz-rich and volcanic rocks

Green aventurine pendant (likely)

Quartz, SiO₂, with green fuchsite inclusions (aventurescent quartz)

Weathered limestone

Calcite-rich carbonate rock, predominantly CaCO₃ (often micritic or bioclastic limestone)

Rounded sandstone pebble

Sandstone, predominantly quartz with feldspar and iron-oxide cement

Weathered limestone

Limestone; predominantly calcite (CaCO₃)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Weathered limestone (likely fossiliferous limestone)

Calcite-rich carbonate rock, predominantly CaCO₃

Chalky limestone fragment

Micritic limestone, chiefly calcite (CaCO₃)

Iron-rich meteorite candidate (weathered iron meteorite)

Likely Fe–Ni metal, commonly kamacite and taenite; definitive identification requires laboratory testing

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃)

Small brown mineral or rock fragment

Undetermined; the image does not show enough detail for reliable identification

Polished green stone, likely aventurine or jade

Most likely green aventurine quartz (SiO₂) or nephrite jade (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); image alone cannot distinguish them

Likely tumbled basalt

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and minor olivine

Rounded dark basalt pebble

Basalt, a fine-grained mafic volcanic rock

Black basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Rounded limestone pebble

Micritic limestone, primarily calcite (CaCO₃)

Weathered limestone or calcarenite fragment

Micritic limestone, likely calcite-dominated (CaCO₃)

Dark basalt pebble

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine

Chalky limestone fragment

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Likely limestone fragment

Calcite-rich carbonate rock; primarily calcium carbonate (CaCO₃)

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or dolomitic

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Basalt

Basalt; fine-grained mafic volcanic rock, mainly plagioclase and pyroxene with possible olivine

Biotite–quartz–feldspar schist

Mica schist; chiefly quartz (SiO₂), feldspar, and biotite mica

Likely basalt pebble

Basalt, a fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and sometimes olivine

Weathered sandstone

Quartz-rich sandstone, likely arkose or lithic sandstone

Rounded basalt pebble

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Pale weathered pebble, likely limestone

Limestone, predominantly calcite (CaCO₃); exact identification is uncertain from the image

Weathered granite or granitic gneiss fragment

Granite; chiefly quartz, alkali feldspar, plagioclase, and minor mica/iron oxides

Gold Nugget

Native Gold (Au)