Organic (Paper And Cellulose)

White Marble

Metamorphic Limestone (CaCO3)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Graphite-rich schist (probable graphite ore)

Graphite schist; chiefly graphitic carbon (C) with quartz, mica, and possibly feldspar

Limestone with Calcite Crystals

Calcium Carbonate (CaCO3)

Desert Rose (Baryte or Selenite)

Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4·2H2O)

Pyrite

Iron Disulfide (FeS2)

Polished gray pebble, likely quartzite or chert

Quartzite (mostly SiO₂), tentative identification

Horn Coral Fossil

Order Rugosa

Agate

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Polished fossiliferous chert or silicified limestone pebble

Microcrystalline quartz (SiO₂), possibly with calcite and iron-oxide inclusions

Tumbled pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), pink variety commonly called rose quartz

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Polished tiger’s-eye

Quartz (SiO₂), chatoyant fibrous variety; commonly golden-brown tiger’s-eye

Banded Gneiss River Pebble

Gneiss

Polished pale stone, likely limestone or quartzite pebble

Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase + pyroxene, sometimes olivine)

Marble

Recrystallized Calcite (CaCO3)

Polished banded agate pebble

Chalcedony (microcrystalline quartz), SiO₂, with iron-oxide or other mineral banding

Chalcedony Nodule (Carnelian/Agate)

Chalcedony (Silicon Dioxide, SiO2)

Polished yellow-brown stone, likely serpentine or jasper

Serpentine-group mineral aggregate, commonly antigorite/lizardite; possibly iron-rich jasper

Tumbled black stone, likely basalt or black jasper

Probably basalt (fine-grained plagioclase–pyroxene rock); exact identification is uncertain from the image

Orthoceras Fossil Limestone

Orthoceras (extinct genus of cephalopod); Limestone matrix (CaCO3)

Limestone

Calcareous sedimentary rock (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Polished agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with possible included iron oxides

Fossil coral fragment

Likely fossilized colonial coral, commonly Hexagonaria (Petoskey stone) or related tabulate coral

Quartz-lined agate/geode slice

Microcrystalline quartz (chalcedony, SiO₂) with drusy quartz; possibly calcite inclusions

Milky quartz (likely tumbled or polished)

Quartz, silicon dioxide (SiO₂)

Thunderegg (Agetized Geode nodule)

Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Magnetite-rich black sand

Magnetite (Fe₃O₄), likely mixed with other heavy minerals

Granite with Orthoclase and Hematite Staining

Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)

Orange chalcedony (carnelian), possibly amber

Carnelian: microcrystalline quartz, SiO₂; amber: fossilized plant resin

Likely anthracite coal

Anthracite; predominantly carbon (C), with minor mineral impurities

Quartz Pebble with Muscovite Mica

Quartzite / Quartz-Mica Schist pebble (SiO2 with KAl2(AlSi3O10)(OH)2)

Pyrite

Iron Sulfide (FeS2)