Sedimentary Or Igneous Fragment

Obsidian (likely black volcanic glass)

Obsidian; naturally occurring rhyolitic glass, primarily SiO₂

Weathered blue-speckled granite or granitic rock

Granite, likely quartz–feldspar–mica aggregate; blue grains may be sodic feldspar or altered minerals

Biotite granite (possibly pegmatitic granite)

Granite: quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈), and biotite mica

Obsidian (likely black obsidian)

Volcanic glass; predominantly rhyolitic silica-rich melt (approximately 70–80% SiO₂)

Dark gray fine-grained stone, likely basalt or andesite

Basalt–andesite volcanic rock; commonly composed of plagioclase, pyroxene, and possibly olivine or magnetite

Dark gray fine-grained rock, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, often with minor olivine and magnetite

Weathered granite (likely)

Granite, a quartz–feldspar–mica intrusive igneous rock

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Unidentified weathered rock, possibly quartz-bearing granite or rhyolite

Indeterminate; likely quartz–feldspar-rich silicate rock

Iron Meteorite (Campo del Cielo)

Iron Meteorite, Group IAB (FeNi Alloy: Kamacite and Taenite)

Fossiliferous Limestone

Biomicrite / Fossiliferous Limestone (CaCO3)

Likely quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Small weathered rock fragment, likely iron-stained sandstone

Probable quartz-rich sandstone (dominant mineral: SiO₂); exact identification is uncertain from the image

Diorite with Xenolith

Phaneritic Intermediate Plutonic Rock

Rounded river pebble, likely basalt or dark volcanic rock

Probably fine-grained basalt; exact identification requires testing

Weathered iron-rich rock, possibly basalt or ironstone

Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Pyrite

Iron Disulfide (FeS2)

Stream cobbles and gravel

Unidentified mixed fluvial clasts; likely quartzite, sandstone, and igneous/metamorphic fragments

Fossiliferous Limestone Pebble

Limestone with fossil inclusion

Ironstone Concretion

Siderite or Hematite Concretion

Chert (and Chert Flake)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red/pink tumbled mineral fragment

Indeterminate; possibly dyed quartz, ruby/corundum, or red glass-like chalcedony

Granite or Quartzite fragment

Granite / Quartzite

Weathered brown rock fragment, possibly iron-rich sandstone or altered basalt

Indeterminate; likely an iron-oxide–stained silicate rock

Likely weathered pink granite or feldspathic rock fragment

Granite, approximately quartz–feldspar–mica aggregate; exact identification is uncertain from the image

Quartz-bearing feldspathic rock fragment

Likely granitic pegmatite or quartz–feldspar vein material; predominantly quartz (SiO₂) and feldspar

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Fossil shell fragment

Indeterminate mollusk shell; likely gastropod or bivalve, composed mainly of calcium carbonate (aragonite/calcite)

Likely granite or granitic rock fragment

Granite; primarily quartz, feldspar, and mica

Small weathered quartz-rich rock, possibly granite or feldspar-bearing stone

Uncertain; likely quartz–feldspar aggregate, potentially granitic rock

Breccia

Breccia (Clastic Sedimentary Rock)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Breccia

Breccia - Clastic sedimentary rock

Quartz-rich rock fragment

Likely milky quartz (SiO₂), possibly a pale quartzite fragment

Likely weathered sandstone fragment

Sandstone, composed mainly of quartz (SiO₂) and feldspar grains in a clay, silica, or iron-oxide cement

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Coquina

Biogenic Limestone (Calcitic shells)

Raw Garnet Fragment

Nesosilicate Group (e.g., Almandine, Fe3Al2(SiO4)3)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)