Sedimentary (Processed Mineral Product)

Bauxite

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

Faceted gemstone pendant, likely quartz or citrine

Indeterminate from photograph; likely quartz (SiO₂), possibly yellow citrine or treated quartz

Black stone bead bracelet

Likely black tourmaline (schorl), though identification is uncertain from the image

Pink Granite

Phaneritic intrusive felsic igneous rock

Granite (Pink/Potassium-rich)

Pink Granite (contains K-Feldspar, Quartz, and Plagioclase)

Quartzite

Quartzite (SiO2)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

Polished orbicular/porphyritic granite or breccia

Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image

Likely weathered basalt or vesicular volcanic rock

Basalt, composed mainly of plagioclase feldspar, pyroxene, and minor olivine/iron oxides

Worn River Pebble with Fossil Indentation

Sedimentary Rock with Fossil Infill

Limestone

Calcium Carbonate (CaCO3)

Botryoidal Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Granite

Phaneritic plutonic igneous rock (SiO2 range 65-75%)

Tumbled milky quartz pebble

Quartz (SiO₂), likely milky quartz

Weathered granite or granitic gneiss slab

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Quartz with Matrix

Silicon Dioxide (SiO2)

Scoria

Vesicular Mafic Igneous Rock

Banded agate bangle

Agate (microcrystalline quartz, SiO₂), likely gray-blue chalcedony with parallel banding

Gemstone-set ring, likely cubic zirconia or diamond

Likely synthetic cubic zirconia (zirconium dioxide, ZrO₂); stones may alternatively be diamond (carbon, C)

Galena

Galena (lead sulfide, PbS)

Shark Tooth Fossil

Vertebrate fossilized tooth

Dark blue polished stone pendant

Indeterminate; possibly sodalite, lapis lazuli, or blue slag/glass-like material

Likely industrial slag or weathered basalt

Basaltic rock; possibly iron-rich furnace slag (diagnosis uncertain from image)

Coprolite

Fossilized Feces

Graphite

Graphite (Carbon, C)

Iron Slag

Anthropogenic pyrometallurgical byproduct

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

Quartz (Granular)

Silicon Dioxide (SiO2)

Tumbled basalt (likely basalt–feldspar/zeolite-bearing stone)

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine or secondary alteration minerals

Likely quartz-bearing metamorphic pebble

Indeterminate; probable quartzite or quartz-rich gneiss with dark mica/amphibole

Serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite, commonly with magnetite and chlorite

Tumbled feldspar-rich rock, likely pink-orange microcline or granite fragment

K-feldspar (microcline/orthoclase), approximately KAlSi₃O₈; exact identification requires testing

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxide-coated

Likely weathered granite or granitic pegmatite fragment

Granite/granitoid, chiefly quartz (SiO₂), feldspar, and mica

Small weathered mineral/rock fragment

Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen

Orange Calcite

Calcium Carbonate (CaCO3)

White chalcedony cabochon ring

Chalcedony (microcrystalline quartz, SiO₂), likely white quartz variety

Iridescent bismuth crystal

Bismuth (Bi), commonly laboratory-grown and oxide-coated

Orange Calcite

Calcium Carbonate (CaCO3)

Dragon Vein Agate

Chalcedony (Quartz) - SiO2

Botryoidal Quartz

Silicon Dioxide (SiO2)