Not A Rock Or Mineral

Tumbled banded sandstone pebble

Quartz-rich sandstone (lithified siliciclastic sediment)

Weathered granite or granitic gneiss pebble

Granite: quartz + feldspar + mica; possibly weakly foliated gneiss

Rock crystal (clear quartz)

Quartz, silicon dioxide (SiO₂), likely milky/included quartz

Bauxite

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

Yellow quartz-bearing rock, possibly sulfur-stained quartz or calcite

Indeterminate; likely quartz (SiO₂) and/or calcite (CaCO₃) with yellow iron/sulfur staining

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Mica-rich schist (likely quartz-mica schist)

Quartz–mica schist, commonly containing muscovite and/or biotite with quartz and feldspar

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Granite (rounded cobble)

Granite; chiefly quartz, potassium feldspar, plagioclase, and mica

Milky quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Blue druzy quartz cluster

Quartz, SiO₂; blue coloration likely from inclusions or surface treatment

Iron-rich weathered rock or limonite/goethite nodule

Limonite (mixture dominated by goethite, FeO(OH)·nH₂O), possibly with quartz or clay

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

Red coral beads

Precious coral, commonly Corallium rubrum (calcium-carbonate skeleton)

Weathered iron-rich rock fragment

Provisional identification: limonite/goethite-rich material, likely an ironstone fragment

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Faceted glass-like gemstone (likely synthetic quartz or cubic zirconia)

Identification uncertain; possibilities include synthetic quartz (SiO₂) or cubic zirconia (ZrO₂)

Likely metamorphic schist

Mica schist, probably quartz–biotite schist

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Marine gastropod shell

Calcium-carbonate shell, primarily aragonite; species cannot be determined from the image

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Likely weathered brown rock or iron-rich mineral specimen

Indeterminate from image; possible limonite/goethite-rich material

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Pink granite

Coarse-grained felsic intrusive rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Polished fossiliferous limestone

Bioclastic carbonate rock, primarily calcite (CaCO₃)

Schist

Schist; commonly mica schist, composed chiefly of muscovite/biotite mica with quartz and feldspar

Bauxite

Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)

Fossilized ammonite

Ammonoidea (likely a small, chambered ammonite fossil)

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Limonite (Yellow Ochre)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Weathered volcanic breccia (possible basaltic-andesite breccia)

Volcanic breccia: angular to subrounded volcanic clasts in a finer volcanic matrix; exact composition cannot be confirmed from the photograph

Note regarding baguette production (not a rock)

Digital text image - Somali language

Biotite schist (mica-rich metamorphic rock)

Mica schist, chiefly quartz, feldspar, and biotite mica