Sedimentary (Processed Mineral Product)

Metal Chain Belt with Square Plates

Not applicable (man-made)

Pink Granite

Phaneritic intrusive igneous rock with dominant Alkali Feldspar

Quartz

Silicon Dioxide (SiO₂)

Chert (Flint)

Silicon Dioxide (SiO2)

Chrysoprase

Chalcedony (cryptocrystalline SiO2 variety)

Faceted Quartz (Rock Crystal)

Crystalline Silicon Dioxide (SiO2)

Tumbled granite (likely granite or granitic gneiss)

Granite; chiefly quartz (SiO₂), feldspar, and mica, with possible alteration minerals

Opalite

Synthetic Opalized Glass / Man-made Glass

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Pyrite nodule (probable iron sulfide concretion)

Pyrite, FeS₂, likely weathered within a sedimentary concretion

Weathered, iron-stained quartz-rich pebble (uncertain identification)

Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions

Limestone

Calcium Carbonate (CaCO3)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Peacock ore (bornite/chalcopyrite), likely treated

Bornite, Cu₅FeS₄, and/or chalcopyrite, CuFeS₂

Limonite-goethite ironstone specimen

Goethite (α-FeO(OH)) with limonite, quartz, and iron oxides

Limestone

Calcium Carbonate (CaCO3)

Iron-rich weathered rock, possibly limonite/goethite-bearing ore

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite and other oxides possible)

Chert (specifically Yellow/Common Opal or Jasper mixture)

Silicon Dioxide (SiO2)

Weathered gneiss

Banded gneiss, commonly composed of quartz, feldspar, and mica

Rock Specimen

Unclassified rock specimen

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Beach Quartzite Pebble

Quartzite (primarily SiO2)

Tumbled milky quartz pebble

Quartz (SiO₂), likely massive milky quartz

Weathered granite

Granite; interlocking quartz–feldspar–mica aggregate

Himalayan Pink Salt

Halite (NaCl) with iron oxide inclusions

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Copper slag or vesicular basalt with copper minerals

Industrial slag / Basaltic matrix with secondary copper minerals

Green sea glass (likely bottle glass)

Human-processed soda–lime silicate glass; not a natural mineral or rock

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from trace iron and irradiation, likely in an amethyst/quartz matrix

Rose Quartz Beads

Crystalline Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Polished agate bracelet (likely gray chalcedony)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Weathered Sandstone Cobble

Arenite / Quartz Sandstone

Rodonite

Rhodonite (MnSiO3)

Greenstone or Epidote-rich Metamorphic Rock

Chlorite/Epidote Schist or Greenstone

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Granite

Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Carved quartz (likely rose quartz and green aventurine/quartz)

Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine